Marieb Human Anatomy & Physiology Chapter 1 - The Human Body: An Orientation

Comprehensive vocabulary flashcards generated from Marieb Human Anatomy & Physiology Chapter 1 lecture notes, covering core concepts, levels of organization, organ systems, homeostasis, directional terminology, body planes, and cavities.

Anatomy

The study of body structure, including what body parts look like, where they are located, and how they are arranged.

Physiology

The study of body function, explaining how body parts work and what they do.

Principle of Complementarity of Structure and Function

The principle stating that structure determines what a body part can do.

Gross (Macroscopic) Anatomy

The study of body structures that can be seen with the naked eye without a microscope.

Regional Anatomy

The branch of gross anatomy that studies all structures in one particular body region, such as the abdomen or arm.

Systemic Anatomy

The branch of gross anatomy that studies one organ system throughout the body, such as the skeletal system.

Surface Anatomy

The study of internal body structures as they relate to the overlying body surface.

Microscopic Anatomy

The study of body structures that are too small to be seen without a microscope.

Cytology

The microscopic study of cells.

Histology

The microscopic study of tissues.

Developmental Anatomy

The study of structural changes that occur in the body from conception through adulthood.

Embryology

A branch of developmental anatomy focusing on structural development before birth, especially early development.

Cell

The structural level where molecules form organelles and cells; it represents the smallest living unit of the body.

Tissue

A level of organization consisting of groups of similar cells working together to perform a common function.

Integumentary System

The organ system comprising skin, hair, nails, and sweat and oil glands; protects the body, helps regulate body temperature, contains sensory receptors, and helps synthesize vitamin D.

Skeletal System

The organ system comprising bones, cartilage, ligaments, joints, and bone marrow; supports and protects the body, provides a framework for movement, stores minerals, and forms blood cells.

Muscular System

The organ system comprising skeletal muscles and associated tendons; produces movement, maintains posture, stabilizes joints, and produces heat.

Nervous System

The fast control organ system comprising the brain, spinal cord, nerves, and sensory receptors; detects changes, processes information, and activates muscles and glands.

Endocrine System

The organ system comprising various glands (such as pituitary, thyroid, adrenal, pancreas, ovaries, and testes) that release hormones to regulate long-term processes like growth, metabolism, reproduction, and stress responses.

Cardiovascular System

The organ system comprising the heart, blood vessels, and blood; pumps and transports blood to deliver oxygen, nutrients, and hormones while removing wastes and carbon dioxide.

Lymphatic/Immune System

The organ system comprising lymphatic vessels, lymph nodes, spleen, thymus, tonsils, and lymphoid tissues; returns leaked fluid to the blood, filters lymph, and defends against infection and disease.

Respiratory System

The organ system comprising nasal passages, pharynx, larynx, trachea, bronchi, and lungs; brings oxygen into the body, removes carbon dioxide, and helps maintain acid-base balance.

Digestive System

The organ system comprising the alimentary canal and accessory organs; breaks down food into smaller molecules, absorbs nutrients and water, and eliminates indigestible material.

Urinary System

The organ system comprising kidneys, ureters, urinary bladder, and urethra; removes nitrogen-containing wastes from blood and regulates water, electrolyte balance, acid-base balance, and blood pressure.

Reproductive System

The organ system responsible for producing sex cells and sex hormones to allow reproduction; in females, it also supports embryonic/fetal development and produces milk.

Metabolism

All chemical reactions occurring in the body, including breaking down substances for energy and building required cellular components.

Responsiveness (Irritability)

The necessary life function involving the ability to sense and respond to changes in the internal or external environment.

Normal Body Temperature

A vital survival need that must remain within a narrow range (typical average about $37^{\circ}\text{C}$ or $98.6^{\circ}\text{F}$) for chemical reactions to occur at proper rates.

Homeostasis

The body's dynamic ability to maintain relatively stable internal conditions even when external or internal environments change.

Receptor (Sensor)

The component of a homeostatic control system that detects a change or stimulus and sends input to the control center.

Control Center

The component of a homeostatic control system that determines the set point, analyzes incoming information, and decides on the appropriate output response.

Effector

The component of a homeostatic control system that carries out the response that alters the controlled variable.

Negative Feedback

The primary homeostatic control mechanism in which the output response reduces or reverses the original stimulus to bring a variable back toward its normal range.

Positive Feedback

A homeostatic control mechanism in which the output response amplifies or increases the original change until a specific external event ends it.

Homeostatic Imbalance

A disturbance in body homeostasis that increases susceptibility to illness and disease and becomes more frequent with aging.

Anatomical Position

Standard body posture used as a reference point: standing upright, facing forward, head level, feet flat and forward, arms at sides, palms facing forward, and thumbs pointing away.

Superior (Cranial)

Directional term meaning toward the head end or upper part of a structure or body; above.

Inferior (Caudal)

Directional term meaning away from the head end or toward the lower part of a structure or body; below.

Anterior (Ventral)

Directional term meaning toward or at the front of the body.

Posterior (Dorsal)

Directional term meaning toward or at the back of the body.

Medial

Directional term meaning toward or closer to the midline of the body.

Lateral

Directional term meaning away from the midline of the body.

Intermediate

Directional term meaning between a more medial and a more lateral structure.

Proximal

Directional term used for limbs meaning closer to the origin of a body part or point of attachment to the trunk.

Distal

Directional term used for limbs meaning farther from the origin of a body part or point of attachment to the trunk.

Superficial (External)

Directional term meaning toward or at the surface of the body.

Deep (Internal)

Directional term meaning farther away from the body surface.

Ipsilateral

Directional term meaning located on the same side of the body.

Contralateral

Directional term meaning located on opposite sides of the body.

Axial Region

Main body region comprising the head, neck, and trunk.

Appendicular Region

Body division comprising the limbs and their attachments to the trunk.

Sagittal Plane

A vertical plane that divides the body into left and right portions.

Midsagittal (Median) Plane

A specific sagittal plane that lies exactly in the midline and divides the body into equal left and right halves.

Parasagittal Plane

A sagittal plane that is offset from the midline, dividing the body into unequal left and right portions.

Frontal (Coronal) Plane

A vertical plane that divides the body into anterior (front) and posterior (back) portions.

Transverse (Horizontal) Plane

A horizontal plane running from right to left that divides the body into superior (top) and inferior (bottom) portions.

Oblique Section

A cut or section made diagonally between horizontal and vertical planes.

Dorsal Body Cavity

The posterior cavity protecting the central nervous system, subdivided into the cranial and vertebral (spinal) cavities.

Ventral Body Cavity

The anterior, larger body cavity containing internal visceral organs; divided by the diaphragm into thoracic and abdominopelvic cavities.

Mediastinum

The central thoracic region situated between the pleural cavities that contains the heart, esophagus, trachea, thymus, and major blood vessels.

Parietal Serosa

The part of a double-layered serous membrane that lines the walls of a closed ventral body cavity.

Visceral Serosa

The part of a double-layered serous membrane that directly covers the external surface of organs within a ventral body cavity.

Serous Fluid

A thin lubricating fluid produced by serous membranes that lies between parietal and visceral layers to reduce friction during organ movement.

Pleura

The serous membrane associated with the thoracic cavity and the lungs.

Pericardium

The serous membrane enclosing the heart and lining the pericardial cavity.

Peritoneum

The serous membrane lining the abdominopelvic cavity and covering its enclosed viscera.