Chapter 1: Body Organization and Introduction to Human Physiology

Vocabulary practice flashcards covering fundamental terminology, levels of organization, directional terminology, anatomical planes, body cavities, membranes, homeostasis, and cellular transport mechanisms from Chapter 1.

Anatomy

The study of the structures of the body, literally meaning 'to cut apart'.

Physiology

The study of the functions of the structures of the body.

Principle of Complementarity

The biological principle stating that form follows function.

Gross Anatomy

The study of anatomical structures visible to the naked eye, approached through regional or systemic methods.

Microscopic Anatomy

The study of structural units too small to be seen with the naked eye, subdivided into cytology (cells) and histology (tissues).

Levels of Structural Organization

The hierarchical organization of the body: chemical level (atoms, molecules, organelles), cellular level, tissue level, organ level, system level, and organismal level.

Tissue

A group of similar cells working together to perform a specific function; consists of four primary types: epithelial, connective, muscle, and nervous.

Organ

A structure composed of two or more types of tissue working together to execute a specific function.

Metabolism

The sum of all chemical reactions that occur within the body, including anabolism (building reactions) and catabolism (breakdown reactions).

Differentiation

The developmental transition of a cell from an unspecialized state to a specialized state.

Anatomical Position

The standard reference posture in which an individual stands upright, facing forward, with arms at the sides, palms turned forward/up, and feet together with toes pointing forward.

Body Planes of Reference

Three primary imaginary reference planes dividing the human body: the frontal (coronal) plane, the transverse (horizontal) plane, and the median (midsagittal) plane.

Transverse (Horizontal) Plane

A plane that cuts horizontally through the body, dividing it into superior (top) and inferior (bottom) sections.

Sagittal Plane

A vertical plane that divides the body into right and left halves; called midsagittal when dividing the body into equal halves.

Coronal (Frontal) Plane

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

Proximal and Distal

Directional terms defining proximity relative to a limb's point of attachment: proximal is closer to the attachment point, whereas distal is farther away.

Supine and Prone

Anatomical descriptions of a recumbent horizontal position: supine indicates lying face up, while prone indicates lying face down.

Terms of Laterality

Positional designations based on body symmetry: unilateral (one side), bilateral (two sides), ipsilateral (same side of the body), and contralateral (opposite side of the body).

Axial Division

The core anatomical division of the body, which includes the head, neck, and trunk/torso.

Appendicular Division

The anatomical division encompassing the upper and lower extremities (arms and legs).

Dorsal Body Cavity

The posterior fluid-filled cavity subdivided into the cranial cavity (housing the brain) and the vertebral canal (housing the spinal cord).

Ventral Body Cavity

The anterior body cavity subdivided by the diaphragm into the thoracic cavity and the abdominopelvic cavity.

Thoracic Cavity Serosae

Serous compartments within the chest, featuring the bilateral pleural cavities containing the lungs and the centrally located pericardial cavity containing the heart within the mediastinum.

Mediastinum

The central compartment of the thoracic cavity situated between the lungs, containing the heart, esophagus, trachea, and thymus gland.

Abdominopelvic Quadrants

The clinical division of the anterior abdomen into four quadrants: right upper quadrant, left upper quadrant, right lower quadrant, and left lower quadrant.

Abdominopelvic Regions

The nine anatomical divisions of the abdomen: right hypochondriac, epigastric, left hypochondriac, right lumbar, umbilical, left lumbar, right iliac (inguinal), hypogastric (pubic), and left iliac (inguinal).

Serous Membrane Relationship

A two-layered lining structure modeled as a fist pushed into a balloon: parietal serosa lines cavity walls, visceral serosa covers organ surfaces, and a fluid-filled serous cavity lies between them to reduce friction.

Pericardium

The double-layered serous sac enclosing the heart, consisting of an outer parietal pericardium, an inner visceral pericardium, and an intervening serous fluid-filled pericardial cavity.

Mucous Membranes

Epithelial membranes that secrete mucus and line cavities and passageways directly exposed to the exterior environment, such as the digestive and respiratory tracts.

Synovial Membranes

Connective tissue membranes that line freely movable joint cavities and secrete synovial fluid for joint lubrication.

Homeostasis

The condition of maintaining a relatively dynamic, stable internal environment despite external fluctuations.

Feedback Loop

A circular physiological control pathway where a receptor detects an environmental change, a control center sets the acceptable range and directs output, and an effector generates a corrective response.

Negative Feedback System

The primary homeostatic mechanism wherein the bodily response reverses or negates the initial stimulus to restore a normal set point (e.g., blood glucose and body temperature).

Positive Feedback System

A regulatory mechanism that amplifies and intensifies the original stimulus, driving the system further away from the baseline set point (e.g., blood clotting and labor contractions).

Active Transport

Cellular transport mechanisms requiring cellular energy ($\text{ATP}$) to move larger molecules or transport substances against a concentration gradient from low to high concentration.

Passive Transport

The net movement of substances down a concentration gradient from high to low concentration without the requirement or expenditure of cellular energy ($\text{ATP}$).