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Film Producing Final
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Producing DNA fragment
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Loie Fuller: The Art of Illusion * Known for her innovative use of fabric, light, and color to create captivating visual illusions in performance. * Her work emphasized the image created rather than the physicality of the dancer's body, marking a shift in performance art. * Patented several costume and set designs, including the iconic Serpentine dress and the glass floor for Fire Dance, showcasing her ingenuity. * Premiered notable works such as The Serpentine (1889) and Fire Dance (1895), which were pivotal in her career. * Succeeded in creating an aesthetic transformation, emphasizing individual interpretation of visual experiences. Isadora Duncan: The Mother of Modern Dance * An eccentric figure who rejected traditional ballet, favoring movement inspired by emotion and nature's rhythms. * While she did not create a new dance technique, she introduced a new motivation for movement, rooted in nostalgia for Ancient Greece. * Her philosophy emphasized that motion should be driven by emotion and expressed through the entire body, leading to a more natural form of dance. * Duncan's choreography was improvisational, focusing on feeling over form, and drew inspiration from her childhood innocence. * Her performances in St. Petersburg (beginning in 1904) inspired contemporaries like Fokine and Nijinsky, influencing the broader dance community. * Left a legacy of natural, emotional dancing, characterized by bare feet and flowing costumes, as seen in works like Ballspiel (1906) and Five Brahms Waltzes. The Denishawn School and Its Legacy Ruth St. Denis and Ted Shawn: Pioneers of Dance * Ruth St. Denis was captivated by exotic and oriental themes, famously inspired by an Egyptian cigarette poster featuring the goddess Isis. * Her dance Radha was a significant work that launched her career, showcasing her understanding of spectacle and audience engagement. * Ted Shawn played a crucial role in introducing men to professional dance, emphasizing powerful and athletic movement. * He founded an all-male dance company, Ted Shawn and His Male Dancers, and was a driving force behind the Denishawn School. * Shawn established Jacob’s Pillow, a significant dance venue in Massachusetts, which remains influential today. * Their collaboration and individual contributions helped shape the landscape of American dance. The Denishawn School: A Foundation for Modern Dance * Established in Los Angeles in 1915, Denishawn was the first dance school in the U.S. to produce a professional company. * The curriculum included a variety of styles, with a typical day comprising stretching, ballet, Oriental dance, and yoga meditation. * The school closed in 1919, but the Denishawn Company continued to tour, becoming the first U.S. company to perform in the Orient in 1925. * The school created a lineage of dancers, including Martha Graham and Doris Humphrey, who would further develop modern dance. * Denishawn's approach combined various techniques, allowing for a diverse exploration of movement and expression. * The legacy of Denishawn is evident in the evolution of modern dance and its emphasis on personal expression. The Big Four: Shaping Modern Dance Doris Humphrey: The Architect of Dance * Studied at Denishawn from 1917 to 1928, where she formed a creative partnership with Charles Weidman. * Known for her movement theory of 'fall and recovery,' which emphasizes the dynamics of balance and gravity in dance. * Established the Humphrey-Weidman Company in 1928, focusing on structure and technique in choreography. * Authored The Art of Making Dances, which codified choreographic design and emphasized ensemble work over solo performance. * Her choreography often explored themes of human experience and emotion, as seen in works like Water Study (1928). * Left a significant impact on modern dance through her innovative techniques and teachings. Martha Graham: The Psychological Pioneer * Studied at Denishawn from 1916 to 1923, where she developed her unique style of modern dance. * Her first concert as an independent artist in 1926 marked the beginning of the 'Heroic Age' of modern dance. * Graham's choreography often drew from psychoanalysis, focusing on the inner emotional landscape and reinterpreting patriarchal narratives. * Developed the Graham Technique, centered on contraction and release, which became the first codified modern dance technique. * Her company is recognized as the first truly modern dance company, celebrating its centennial milestone. * Graham's legacy includes a profound influence on the perception of dance as a serious art form. Ausdruckstanz and Its Influencers Rudolf Laban and Mary Wigman: Movement Innovators * Ausdruckstanz, or 'expressive dance,' emerged as a response to the cultural movements of the early 20th century, paralleling American modern dance. * Rudolf Laban, a movement scientist, developed a system of movement training and Labanotation for dance notation. * Laban's Movement Choirs allowed for structured improvisation, making dance accessible to all, regardless of training. * Mary Wigman, Laban's student, became a leading figure in German dance, known for her harsh and grotesque style. * Wigman's work often explored apocalyptic themes and the validity of all movement, including the ugly. * The rise of Nazism interrupted the development of Ausdruckstanz, impacting both Laban and Wigman's careers. Hanya Holm: Bridging Cultures in Dance * A student of Mary Wigman, Holm opened the Wigman School in NYC, later renamed the Hanya Holm School of Dance. * Known for her teaching talent, she blended American objectivity with German subjectivity in her methods. * Holm's approach produced highly skilled dancers, emphasizing detailed movement and expression. * Her influence extended through her students and the techniques she developed, contributing to the evolution of modern dance. * Holm's legacy is marked by her ability to adapt and innovate within the dance community. Key Influential Choreographers José Limón * Notable works include The Moor’s Pavane (1949), There is a Time (1956), and Missa Brevis (1958). * Developed the Limón Technique, which emphasizes movement through positions rather than the positions themselves. * Integrates breath (inspired by Doris Humphrey) and gesture (inspired by Charles Weidman) into dance. * Core principles include breath, fall and recovery, succession, and opposition, promoting a holistic approach to movement. * Describes the body as an orchestra, highlighting the importance of coordination and expression in dance. Lester Horton * Born in Indianapolis and moved to Los Angeles in 1928, where he became influenced by Native American cultures. * Inspired to pursue dance after witnessing a Denishawn performance, leading to the creation of the Horton Technique. * Established the first interracial dance company and the Lester Horton Dance Theater, which was the first venue dedicated to modern dance. * Horton Technique focuses on body actions viewed artistically, emphasizing anatomy and conditioning in exercises. * Known for the 17 Fortifications, which include movements like flat backs and lunges, producing versatile and articulate dancers. Katherine Dunham * A pioneer in integrating Black dance traditions into modern dance, she is recognized as the first dance anthropologist. * Conducted research in the West Indies, studying dance as a cultural expression, supported by fellowships from the University of Chicago. * Founded the Katherine Dunham Dance Company and the Dunham School for Arts and Research in 1945. * Major contributions include paving the way for Black dancers and establishing dance anthropology as a field of study. * Developed the Dunham Technique, which combines ballet and modern dance with Afro-Caribbean movements, often accompanied by jazz or polyrhythmic percussion. Modern Dance Techniques Horton Technique * Focuses on the body and its basic actions, viewed through an artistic lens, with a strong emphasis on anatomy and conditioning. * Inspired by 'primitive' cultures, it incorporates movements that reflect these influences. * Training includes foundational movements such as flat backs, lateral T, and lunges, aimed at creating dancers who are 'long and strong'. * The technique promotes versatility and fluidity in movement, allowing for detailed expression. * The Horton class at Butler University exemplifies the application of this technique in a structured learning environment. Limón Technique * Emphasizes movement through positions rather than static positions, focusing on the flow of movement. * Integrates breath and gesture, creating a dynamic interplay between the two. * Built on principles of fall and recovery, succession, and opposition, which are essential for expressive movement. * The concept of the 'body as an orchestra' highlights the importance of coordination and musicality in dance. * Instruction in this technique encourages dancers to explore their physicality and expressiveness. Dunham Technique * Combines principles of ballet and modern dance with a focus on torso isolations and Afro-Caribbean movements. * Musical accompaniment typically features jazz or polyrhythmic percussion, enhancing the cultural fusion in the dance. * The technique showcases a blend of American dance and Black dance heritage, enriching the modern dance landscape. * Dunham's work emphasizes the importance of cultural context in dance, reflecting her anthropological background. * The technique has influenced many dancers and choreographers, expanding the scope of modern dance. Postmodern Dance Movement A Postmodern America * Emerged in 1945, following WWII, characterized by skepticism and socio-political unrest. * Youth culture began to rebel against the traditional values of their parents, leading to significant cultural shifts. * Key events of the 1960s, such as the Women's and Civil Rights Movements, shaped the artistic landscape. * The assassinations of prominent figures like JFK, MLK, and Malcolm X, along with the Vietnam War and Cuban Missile Crisis, influenced the themes in postmodern art. * This period marked a departure from traditional narratives in dance, paving the way for new forms of expression. Merce Cunningham * Regarded as a revolutionary figure in the arts, comparable to Picasso and Stravinsky, he danced with Martha Graham from 1939 to 1945. * Challenged the necessity of meaning in dance, often at odds with the groundedness of Graham's technique. * Founded the Merce Cunningham Dance Company in 1953, which continued until 2011, following his wishes for a legacy tour. * His technique blends ballet and modern styles, emphasizing verticality and clarity of form. * Cunningham's choreography often utilized chance methods, allowing for equality among movements and ideas. Paul Taylor * Danced with Graham, Cunningham, and Balanchine, becoming a significant figure in modern dance. * His choreography reflects a unique blend of influences, resulting in a distinctive style that remains relevant today. * Taylor's work is characterized by openness to movement possibilities, creating a varied body of work. * While he did not codify a specific technique, his signature style incorporates balletic ideas with a more connected performance feel. * His choreography often features a two-dimensional aesthetic and specific movement shapes, such as the Taylor V. The Judson Dance Theater and Grand Union Characteristics of Postmodern Dance * Rejects the boundaries between high and low art, promoting a more inclusive artistic dialogue. * Emphasizes process over product, focusing on the exploration of ideas rather than traditional narratives. * Disregards the boundaries between different art mediums, allowing for a fusion of styles and expressions. * The Judson Dance Theater served as a public performance space for experimental movement artists, fostering innovation in dance. * Grand Union furthered these ideals, creating a collaborative environment for diverse artistic expressions. Overview of Postmodern Dance Key Characteristics of Postmodern Dance * Emphasizes process over product, valuing the journey of creation rather than the final performance. * Rejects formalism and traditional labels, allowing for a broader interpretation of what dance can be. * Embraces the ephemeral nature of dance, recognizing that each performance is unique and transient. Historical Context and Key Figures * The dominant period of postmodern dance was from 1962 to 1964, with significant performances starting on July 6, 1962. * Key artists include Yvonne Rainer, Steve Paxton, and Trisha Brown, who were instrumental in shaping the movement. The Grand Union Collective * Formed from a project initiated by Yvonne Rainer, emphasizing collaboration and close working relationships among members. * Operated from 1970 to 1976, with performances that were entirely improvised, showcasing the spontaneity of the art form. * Members included prominent figures like Rainer, Paxton, and Brown, who contributed to the collective's innovative approach. Influential Artists and Their Contributions Yvonne Rainer * Rainer is considered the most significant figure of the Judson Dance Theater era, known for her shift from traditional techniques to more accessible forms of dance. * Her 'No Manifesto' articulated the principles of postmodern dance, advocating for a rejection of conventional aesthetics. * 'Trio A' (1966) is her most famous work, characterized by its minimalist approach and focus on movement rather than narrative. Steve Paxton and Contact Improvisation * Paxton founded Contact Improvisation (CI) in 1972, which emphasizes a shared experience between dancers, alternating roles of giving and receiving weight. * CI encourages uninhibited movement and connection, allowing for personal expression and exploration. * The lack of codification in CI promotes diverse teaching methodologies, making it adaptable to various styles. Trisha Brown * Brown is a leading figure in postmodern dance, known for her innovative use of improvisation as a choreographic tool. * Her technique focuses on gravity, exploring how to release into it and its effects on the body. * 'Set and Reset' (1983) is a hallmark of her work, showcasing collaboration with artists like Robert Rauschenberg and Laurie Anderson. The Evolution of Dance Styles The Balanchine Legacy * George Balanchine's neoclassicism transformed ballet, making it more athletic and less courtly, influenced by modern and jazz dance. * His work laid the foundation for the New York City Ballet (NYCB) and inspired emerging choreographers like William Forsythe. * Arthur Mitchell, the first African American ballet star at NYCB, founded the Dance Theatre of Harlem, integrating African American traditions into ballet. Twyla Tharp's Innovations * Tharp emerged from the postmodern movement, merging its ideas with ballet to expand the boundaries of both forms. * Founded Twyla Tharp Dance in 1965, focusing on space, time, and pedestrian movement. * Her work emphasizes creativity and improvisation, showcasing a blend of various dance styles. Contemporary Dance Practices Contemporary Training Techniques Technique Name Description Countertechnique Investigates principles of dynamic balance. Gaga Improvisational, rooted in descriptive imagery. Flying Low Focuses on using the body’s natural spiralic energy. Release Technique Centers on breath and fluidity through the joints. FoCo Technique Merges concepts from Chinese classical and modern. Somatic Practices Prioritizes feeling and sensing over visual cues. Commentary Through Choreography * Dance serves as a vessel for social commentary, addressing various social, political, and global issues. * The universal language of the body allows for a performance platform that transcends cultural barriers. * Choreographers often engage in deep research to elevate their work beyond mere entertainment, creating pieces that are literal, abstract, or metaphorical. Social Justice in Dance Bill T. Jones and His Impact * Bill T. Jones is a prominent choreographer known for using dance as a vehicle for social change, particularly during the AIDS epidemic. * His work often incorporates elements of performance art, including spoken word and multimedia. * Founded the Bill T. Jones/Arnie Zane Dance Company in 1982, which continues to thrive today. Notable Works by Bill T. Jones * 'D-Man in the Waters' (1989) addresses the aftermath of personal loss and the AIDS crisis. * 'Last Supper at Uncle Tom’s Cabin/The Promised Land' (1990) explores themes of suffering and faith. * 'Still/Here' (1994) emerged from workshops with terminally ill individuals, gaining notoriety for its poignant exploration of mortality. * His recent work, 'Deep Blue Sea' (2021), reflects on social justice issues during the COVID-19 pandemic and the Black Lives Matter movement. Undergraduate Study in Dance Degree Types and Focus Areas * Bachelor of Fine Arts (BFA): Emphasizes performance and choreography, preparing students for careers in dance performance and creative roles. * Bachelor of Arts (BA): Balances performance with a broader liberal arts education, allowing for a more diverse academic experience. * Bachelor of Science (BS): Focuses on scientific and quantitative studies, often including courses in dance sciences like kinesiology and movement therapies. Core Coursework in BFA Programs * Dance Technique: Varies by program, covering various styles and foundational skills. * Choreography: Includes practical experience in creating dance pieces, often with a focus on Dance for Camera. * Dance Pedagogy: Prepares students for teaching dance, covering methods and educational theories. * Anatomy and Kinesiology: Essential for understanding the physical body in relation to dance, enhancing performance and injury prevention. Additional Opportunities in Undergraduate Programs * Performance Opportunities: Students can perform in works by faculty, guest artists, and peers, gaining practical experience. * Masterclasses and Guest Lectures: Exposure to industry professionals enhances learning and networking. * Internships: Provide real-world experience and professional connections in the dance field. Graduate and Doctoral Study in Dance Types of Graduate Degrees * Master of Fine Arts (MFA): A terminal degree focusing on performance and creative research, essential for advanced artistic careers. * Master of Arts (MA): Often a stepping stone to Ph.D. work, focusing on liberal arts research or non-performance areas like Movement Therapy. * Ph.D. in Dance: Terminal degree for those pursuing research in educational, historical, or anthropological aspects of dance. Importance of Terminal Degrees * Terminal degrees are crucial for teaching positions in higher education, ensuring educators have advanced knowledge and skills. * They provide a pathway for specialized research, contributing to the academic field of dance. Transferable Skills from Dance Training Key Skills Developed * Time Management: Balancing rigorous training schedules with academic responsibilities. * Teamwork and Collaboration: Essential for group performances and choreographic projects. * Creative Thinking: Developing innovative solutions in choreography and performance. * Leadership: Opportunities to lead projects or direct performances enhance leadership skills. Career Opportunities in Dance Diverse Career Paths * Performance: Opportunities as company dancers or freelance artists in concert and commercial settings. * Choreography: Roles as resident choreographers or freelance artists, including dance filmmaking. * Teaching: Positions in private studios, public schools, and higher education, including curriculum development. Complementary Fields * Physical Therapy and Exercise Science: Important for injury prevention and rehabilitation for dancers. * Technical Theater: Involves stage management, costume design, and lighting design, supporting dance productions. * Nutrition and Dietetics: Essential for maintaining health and performance levels in dancers. Challenges in the Dance Industry Key Challenges Faced * Funding: Securing financial support for training and performances remains a significant hurdle. * Societal Perception: The relevance of artists is often questioned, impacting funding and support. * Job Stability: Economic factors and the nature of the industry can lead to instability in careers. The Evolution of Dance Categories Traditional Definitions * Concert Dance: Focuses on artistic expression in formal settings, traditionally dominated by ballet and modern styles. * Commercial Dance: Aimed at mainstream audiences, includes hip hop, street dance, and Broadway, requiring different training focuses. Blurring the Lines Between Categories * The rise of versatile training in the 1980s and 1990s has led to a blending of concert and commercial styles. * Shows like So You Think You Can Dance have increased exposure for dancers, allowing them to cross between genres. Dance as Sport Athleticism in Dance * Professional dance requires physical attributes similar to those in traditional sports, including strength, endurance, and flexibility. * Cross-training is essential for dancers to enhance their physical skills and performance capabilities. Dance Competitions * Competitions are organized regionally and nationally, with categories based on age, level, and genre. * Scoring systems evaluate technique, performance, and choreography, with awards given for various achievements. Pros and Cons of Dance Competitions Advantages of Dance Competitions * Dance competitions elevate the visibility of dance as a sport, engaging both dancers and audiences in a competitive atmosphere. * They provide young dancers with valuable experiences in handling rejection and understanding the subjective nature of performance evaluation. * Competitions encourage versatile training, which can serve as a launchpad for professional careers, emphasizing the importance of time management, personal responsibility, and teamwork. * Many competitions offer scholarship opportunities and conventions, enhancing training, networking, and exposure for participants. Challenges and Criticisms of Dance Competitions * Technical training may be compromised in competitive studios, focusing more on choreography and tricks rather than foundational skills. * The emphasis on sports elements can overshadow the artistic aspects of dance, influencing teaching practices in studios. * Choreography may lack individuality as dancers often follow trends that are more likely to win competitions. * Issues of hypersexuality in young dancers and the appropriateness of choreography/music are prevalent during competition seasons
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System Interactions in Animals Tools Finish System Interactions in Animals The human body is made of many different organ systems. Each system performs unique functions for the body, but the systems also interact with each other to perform more complex functions. Major Organ Systems Body Systems In humans, cells, tissues, and organs group together to form organ systems. These systems each perform different functions for the human body. The major organ systems and their functions in humans include: The Nervous System — The nervous systems consists of two parts. The central nervous system consists of the brain and spinal cord, while the peripheral nervous system consists of nerves that connect the central nervous system to other parts of the body. The brain plays an important role in interpreting the information picked up by the sensory system. It helps in producing a precise response to the stimuli. It also controls bodily functions such as movements, thoughts, speech, and memory. The brain also controls many processes related to homeostasis in the body. The spinal cord connects to the brain through the brainstem. From the brainstem, the spinal cord extends to all the major nerves in the body. The spinal cord is the origin of spinal nerves that branch out to various body parts. These nerves help in receiving and transmitting signals from various body parts. The spinal cord helps in reflex actions of the body The smallest unit of the nervous system is the nerve cell, or neuron. Neurons communicate with each other and with other cells by producing and releasing electrochemical signals known as nerve impulses. Neurons consist of the cell body, the dendrites, and the axon. The cell body consists of a nucleus and cytoplasm. Dendrites are specialized branch-like structures that help in conducting impulses to and from the various body parts. Axons are long, slender extensions of the neuron. Each neuron possesses just a single axon. Its function is to carry the impulses away from the cell body to other neurons. The Circulatory System — The circulatory (or cardiovascular) system is composed of the heart, arteries, veins, and capillaries. The circulatory system is responsible for transporting blood to and from the lungs so that gas exchange can take place. As the circulatory system pumps blood throughout the body, dissolved nutrients and wastes are also delivered to their destinations. The heart is a muscular organ roughly the size of an adult human's closed fist. It is present behind the breastbone, slightly to the left. It consists of four chambers: right atrium, left atrium, right ventricle, and left ventricle. The heart receives deoxygenated blood from the body and pumps this blood to the lugs, where it is oxygenated. The oxygen-rich blood reenters the heart and is then pumped back through the body. The circulatory system is responsible for transporting blood to and from the lungs so that gas exchange can take place. As the circulatory system pumps blood throughout the body, dissolved nutrients and wastes are also delivered to their destinations. Blood circulation takes place through blood vessels. Blood vessels are tubular structures that form a network within the body and transport blood to each tissue. There are three major types of blood vessels: veins, arteries, and capillaries. Veins carry deoxygenated blood from the body to the heart, except for pulmonary veins, which carry oxygenated blood from the lungs to the heart. Arteries carry oxygenated blood from the heart to different organs, except for the pulmonary artery, which carries deoxygenated blood from the heart to the lungs. The arteries branch out to form capillaries. These capillaries are thin-walled vessels through which nutrients and wastes are exchanged with cells. The Respiratory System — The main structures of the respiratory system are the trachea (windpipe), the lungs, and the diaphragm. When the diaphragm contracts, it creates a vacuum in the lungs that causes them to fill with air. During this inhalation, oxygen diffuses into the circulatory system while carbon dioxide diffuses out into the air that will be exhaled. The trachea branches out into two primary bronchi. Each bronchus is further divided into numerous secondary bronchi. These secondary bronchi further branch into tertiary bronchi. Finally, each tertiary bronchus branches into numerous bronchioles. Each bronchiole terminates into a tiny, sac-like structure known as an alveolus. The walls of each alveolus are thin and contain numerous blood capillaries. The process of gaseous exchange occurs in these alveoli. The diaphragm is a dome-shaped muscle situated at the lower end of the rib cage. It separates the abdominal cavity from the chest cavity. During inhalation, the diaphragm contracts, and the chest cavity enlarges, creating a vacuum that allows air to be drawn in. This causes the alveoli in the lungs to expand with air. During this process, oxygen diffuses into the circulatory system while carbon dioxide diffuses out into the air that will be exhaled. On the other hand, expansion of the diaphragm causes exhalation of air containing carbon dioxide. The Digestive System — The digestive system consists of the mouth, stomach, small intestine, large intestine, and anus. It is responsible for taking in food, digesting it to extract energy and nutrients that cells can use to function, and expelling the remaining waste material. Mechanical and chemical digestion takes place in the mouth and stomach, while absorption of nutrients and water takes place in the intestines. The digestive system begins at the mouth, where food is taken in, and ends at the anus, where waste is expelled. The food taken into the mouth breaks into pieces by the grinding action of the teeth. Carbohydrate digestion starts in the mouth with the breakdown of carbohydrates into simple sugars with the help of salivary enzymes. The chewed food, known as a bolus, enters the stomach through the esophagus. The bolus mixes with acids and enzymes released by the stomach. Protein digestion starts in the stomach as proteins are broken down into peptides. This partially digested food is known as chyme. Chyme enters the small intestine and mixes with bile, a substance secreted by the liver, along with enzymes secreted by the pancreas. The digestion of fats starts in the small intestine as bile and pancreatic enzymes break down fats into fatty acids. The surface of the small intestine consists of hair-like projections known as villi. These villi help in absorbing nutrients from the digested food. The digested food enters the large intestine, or colon, where water and salts are reabsorbed. Any undigested food is expelled out of the body as waste. The Skeletal System — The skeletal system is made up of over 200 bones. It protects the body's internal organs, provides support for the body and gives it shape, and works with the muscular system to move the body. In addition, bones can store calcium and produce red and white blood cells. The Muscular System — The muscular system includes more than 650 tough, elastic pieces of tissue. The primary function of any muscle tissue is movement. This includes the movement of blood through the arteries, the movement of food through the digestive tract, and the movement of arms and legs through space. Skeletal muscles relax and contract to move the bones of the skeletal system. The Excretory System — The excretory system removes excess water, dangerous substances, and wastes from the body. The excretory system also plays an important role in maintaining body equilibrium, or homeostasis. The human excretory system includes the lungs, sweat glands in the skin, and the urinary system (such as the kidneys and the bladder). The body uses oxygen for metabolic processes. Oxygen metabolism results in the production of carbon dioxide, which is a waste matter. The lungs expel carbon dioxide through the mouth and nose. The liver converts toxic metabolic wastes, such as ammonia, into less harmful susbtances. Ammonia is converted to urea, which is then excreted in the urine. The skin also expels urea and small amounts of ammonia through sweat. The skin is embedded with sweat glands. These glands secrete sweat, a solution of water, salt, and wastes. The sweat rises to the skin's surface, where it evaporates. The skin maintains homeostasis by producing sweat in hot environments. Sweat production cools and prevents excessive heating of the body. Each kidney contains about a million tiny structures called nephrons, which filter the blood and collect waste products, such as urea, salts, and excess water that go on to become urine. The Endocrine System — The endocrine system is involved with the control of body processes such as fluid balance, growth, and sexual development. The endocrine system controls these processes through hormones, which are produced by endocrine glands. Some endocrine glands include the pituitary gland, thyroid gland, parathyroid gland, adrenal glands, thymus gland, ovaries in females, and testes in males. The Immune System — The immune system is a network of cells, tissues, and organs that defends the body against foreign invaders. The immune system uses antibodies and specialized cells, such as T-cells, to defend the body from microorganisms that cause disease. The Reproductive System — The reproductive system includes structures, such as the uterus and fallopian tubes in females and the penis and testes in males, that allow humans to produce new offspring. The reproductive system also controls certain hormones in the human body that regulate the development of sexual characteristics and determine when the body is able to reproduce. The Integumentary System — The integumentary system is made up of a person's skin, hair, and nails. The skin acts as a barrier to the outside world by keeping moisture in the body and foreign substances out of the body. Nerves in the skin act as an interface with the outside world, helping to regulate important aspects of homeostasis, such as body temperature. Interacting Organ Systems The organ systems work together to perform complex bodily functions. The functions of regulation, nutrient absorption, defense, and reproduction are only possible because of the interaction of multiple body systems. Regulation All living organisms must maintain homeostasis, a stable internal environment. Organisms maintain homeostasis by monitoring internal conditions and making adjustments to the body systems as necessary. For example, as body temperature increases, skin receptors and receptors in a region of the brain called the hypothalamus sense the change. The change triggers the nervous system to send signals to the integumentary and circulatory systems. These signals cause the skin to sweat and blood vessels close to the surface of the skin to dilate, actions which dispel heat to decrease body temperature. Both the nervous system and the endocrine system are typically involved in the maintenance of homeostasis. The nervous system receives and processes stimuli, and then it sends signals to body structures to coordinate a response. The endocrine system helps regulate the response through the release of hormones, which travel through the circulatory system to their site of action. For example, the endocrine system regulates the level of sugar in the blood by the release of the hormones insulin, which stimulates uptake of glucose by cells, and glucagon, which stimulates the release of glucose by the liver. The nervous and endocrine systems interact with the excretory system in the process of osmoregulation, the homeostatic regulation of water and fluid balance in the body. The excretory system expels excess water, salts, and waste products. The excretion of excessive amounts of water can be harmful to the body because it reduces blood pressure. If the nervous system detects a decrease in blood pressure, it stimulates the endocrine system to release antidiuretic hormone. This hormone decreases the amount of water released by the kidneys to ensure appropriate blood pressure. Appropriate levels of carbon dioxide in the blood are also maintained by homeostatic mechanisms that involve several organ systems. Excess carbon dioxide, a byproduct of cellular respiration, can be harmful to an organism. As blood circulates throughout the body, it picks up carbon dioxide waste from cells and transports it to the lungs, where it is exhaled while fresh oxygen is inhaled. If the concentration of carbon dioxide in the blood increases above a certain threshold, the nervous system directs the lungs to increase their respiration rate to remove the excess carbon dioxide, which ensures that the levels of carbon dioxide in the blood are maintained at appropriate levels. In this way, the circulatory, respiratory, and nervous systems work together to limit the level of carbon dioxide in the blood. Nutrient Absorption To absorb nutrients from food, the nervous, digestive, muscular, excretory, and circulatory systems all interact. The nervous system controls the intake of food and regulates the muscular action of chewing, which mechanically breaks down food. As food travels through the stomach and intestines, the digestive system structures release enzymes to stimulate its chemical breakdown. At the same time, the muscular action, called peristalsis, of the muscles in the wall of the stomach help churn the food and push it through the digestive tract. In the intestines, nutrients from food travel across the surfaces of the villi. The nutrients are then picked up by the blood, and the circulatory system transports the nutrients throughout the cells of the body. The endocrine system releases hormones, such as insulin, that control the rate at which certain body cells use nutrients. Any excess minerals, such as calcium, in the blood are deposited in and stored by the skeletal system. Waste products produced by the use of nutrients, as well as the leftover solid waste from the digestion of food, exit the body through the excretory system. Throughout the process of nutrient absorption, the nervous system controls the muscles involved in digestion, circulation, and excretion. Defense Several body systems interact to defend the body from external threats. The body's first line of defense is the integumentary system, which provide a physical barrier that prevents pathogens from entering the body. The skin of the integumentary system also contains receptors for pain, temperature, and pressure. If an unpleasant stimulus is encountered, these receptors send signals to the central nervous system. In response, the central nervous system sends commands to the muscles to move the body part away from the stimulus. In this way, the integumentary, nervous, and muscular systems interact to prevent damage to the body. In the event of a break in the skin, the nervous, immune, lymphatic, and circulatory systems work together to repair the wound and protect the body from pathogens. When the skin is broken, specialized blood cells called platelets form a clot to stop the bleeding. These platelets also release chemicals that travel through the circulatory system and recruit cells, like immune system cells, to repair the wound. These immune cells, or white blood cells, are transported by the circulatory and lymphatic systems to the site of the wound, where they identify and destroy potentially pathogenic cells to prevent an infection. Some lymphocytes, white blood cells produced by the lymphatic system, also produce antibodies to neutralize specific pathogens. All of the white blood cells involved in the body's response were originally produced in the bone marrow of the skeletal system. If an infection does occur
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