Chapter 1: The Human Organism Vocabulary

Vocabulary practice flashcards covering anatomical terms, levels of organization, body systems, homeostasis, directional terms, body planes, cavities, and serous membranes.

Anatomy

The study of body structures, focusing on their size, shape, location, and composition.

Physiology

The study of how the body functions, focusing on the role of structures and how they interact with other structures.

Chemical Level

The simplest level of structural organization, where atoms join together to make molecules.

Cellular Level

The level of structural organization where molecules join together to make cells.

Tissue Level

The level of structural organization consisting of similar cells working together.

Organ Level

The level of structural organization composed of different tissues working together.

Organ System Level

The level of structural organization consisting of organs working together.

Organism Level

The highest level of structural organization, representing a living thing.

Integumentary System

Body system responsible for protection, temperature regulation, preventing water loss, and vitamin D production; structures include skin, hair, and nails.

Skeletal System

Body system providing protection and support, as well as production of blood cells; structures include bones, cartilage, ligaments, and joints.

Muscular System

Body system responsible for movement, maintaining posture, and producing body heat; includes smooth, skeletal (most abundant), and cardiac muscle.

Nervous System

Body system that regulates homeostasis, detects sensations, controls movement/response, and manages intellectual functions; structures include brain and spinal cord.

Endocrine System

Body system that regulates homeostasis by secreting hormones to control metabolism, growth, and reproduction.

Cardiovascular System

Body system that transports $O_2$, $CO_2$, nutrients, hormones, and waste, and helps regulate temperature; structures include heart and blood vessels.

Lymphatic System

Body system that drains excess interstitial fluid, maintains tissue fluid balance, and fights infection; structures include lymph nodes, tonsils, and spleen.

Respiratory System

Body system responsible for gas exchange by removing $CO_2$ and bringing in $O_2$, as well as regulating blood pH; structures include lungs and trachea.

Digestive System

Body system that breaks down food, absorbs nutrients, and eliminates waste; structures include stomach, intestines, esophagus, and anus.

Urinary System

Body system that removes wastes from blood, expels urine, and regulates pH, ions, and water balance; structures include bladder and kidneys.

Reproductive System

Body system that produces sex cells and supports reproduction; female structures include ovaries, uterus, vagina, mammary glands, and male structures include testes and penis.

Homeostasis

Maintaining a stable internal environment while responding to changes in the external environment.

Set Point

The target value or optimal normal range for a body condition necessary for survival.

Receptor

Component of a feedback loop that detects stimuli, which is the change or deviation from the set point.

Control Center

Component of a feedback loop that receives input, processes the change, determines an appropriate response, and sends instructions to the effector.

Effector

Component of a feedback loop that performs the response to restore homeostasis and return to the set point.

Negative Feedback

A mechanism where deviation from the set point is made smaller or resisted, resulting in a response in the opposite direction of the initial stimulus.

Positive Feedback

A mechanism where deviation from the set point is made greater or amplified, resulting in a response in the same direction of the initial stimulus until the process is complete.

Anatomical Position

The standardized posture where a person is standing erect, facing forward, upper limbs hanging at sides, palms facing forward, and feet facing forward.

Supine

Anatomical position term describing lying face up.

Prone

Anatomical position term describing lying face down.

Superior

Directional term meaning above.

Inferior

Directional term meaning below.

Anterior (Ventral)

Directional term meaning front / belly side.

Posterior (Dorsal)

Directional term meaning back / backside.

Medial

Directional term meaning close to the midline.

Lateral

Directional term meaning away from the midline / toward sides.

Proximal

Directional term meaning close to the point of origin or attachment.

Distal

Directional term meaning far from the point of origin or attachment.

Superficial

Directional term meaning closer to the body surface.

Deep

Directional term meaning away from the surface / more internal.

Abdominopelvic Regions

The nine anatomical divisions of the abdomen: Right hypochondriac, Epigastric, Left hypochondriac, Right lumbar, Umbilical, Left lumbar, Right iliac, Hypogastric, and Left iliac regions.

Sagittal Plane

Body plane that creates left and right sections (mid-sagittal is exactly left and right).

Transverse Plane

Body plane that creates superior and inferior sections.

Frontal (Coronal) Plane

Body plane that creates anterior and posterior sections.

Body Planes

Planes that divide the body so that internal structures can be viewed: Sagittal, Transverse, and Frontal (Coronal).

Thoracic Cavity

Ventral body cavity containing the mediastinum (with the heart inside the pericardial cavity) and pleural cavities (containing the lungs).

Mediastinum

Division of the thoracic cavity containing the esophagus, trachea, and thymus, as well as the pericardial cavity containing the heart.

Peritoneal Cavity

Cavity located inside the abdominal cavity that contains the abdominal organs ('guts').

Body Cavities

Spaces closed to the outside that contain internal organs (viscera), divided into dorsal body cavities (cranial, vertebral) and ventral body cavities (thoracic, abdominal, pelvic).

Parietal Serous Membrane

The outer lining of a double-layered serous membrane that lines the larger cavity and does not touch the organ.

Visceral Serous Membrane

The inner layer of a double-layered serous membrane that directly touches the organ.