The Human Organism: Anatomy and Physiology Essentials

A comprehensive set of vocabulary flashcards covering the basics of human anatomy and physiology, levels of organization, homeostatic mechanisms, anatomical terminology, and major organ systems.

Human Anatomy and Physiology

The scientific study of the structure (anatomy) and function (physiology) of the human body, providing the basis for understanding diseases and evaluating treatments.

Anatomy

The scientific discipline that investigates the structure of the body; it involves dissecting, cutting apart, and separating parts of the body for study.

Systemic Anatomy

The study of the body by systems.

Regional Anatomy

The study of the body by areas.

Surface Anatomy

The study of internal structures of a living person by looking at the external surface.

Anatomical Imaging

A method that involves the use of X-rays, ultrasound, MRI, CT scan, and other modalities to take pictures of internal structures.

Physiology

The scientific discipline that deals with the processes or functions of living things.

Gross (Macroscopic) Anatomy

The study of structures visible to the naked eye.

Microscopic Anatomy

The study of structures at the level of cells and tissues.

Developmental Anatomy

The study of changes that occur from fertilization to adulthood.

Clinical Anatomy

The application of anatomical knowledge in the field of medicine.

Pathology

The medical science dealing with all aspects of diseases, focusing on causes, development of abnormal conditions, and structural/functional changes.

Chemical Level

The level of organization where atoms combine to form molecules, such as collagen molecules that provide skin strength.

Cellular Level

The level where molecules interact to form organelles and cells, which are the basic building blocks of all living things.

Tissue Level

Groups of cells working together to perform specific functions; examples include epithelial, connective, muscle, and nervous tissues.

Organ Level

A structure composed of two or more tissues working in combination to perform several functions, such as the stomach or heart.

Organ System Level

A level where organs interact in groups to perform functions, such as the kidneys and urinary bladder within the urinary system.

Organism Level

The highest level of structural organization, representing an individual living thing such as a human.

Metabolism

All the chemical reactions taking place in an organism, including breaking down substances (catabolism) and synthesizing complex ones (anabolism).

Responsiveness

The ability of an organism to sense changes in its external or internal environment and adjust to those changes.

Homeostasis

The maintenance of a variable, such as body temperature, around an ideal normal value or set point.

Set Point

The ideal normal value around which a variable fluctuates to establish a normal range of values.

Negative Feedback

The primary mechanism for maintaining homeostasis where any deviation from the set point is made smaller or resisted.

Receptor

A sensor that detects stimuli or changes in the internal or external environment.

Control Center

A component, such as the hypothalamus in the brain, that receives and processes information supplied by the receptor.

Effector

A cell or organ that responds to the commands of the control center to carry out a response that restores normal conditions.

Positive Feedback

A mechanism that occurs when an initial stimulus further stimulates a response, making the deviation from the set point even greater until a specific event is completed.

Anatomical Position

A standardized position where a person stands erect with the face directed forward, arms hanging at the sides, and palms facing forward.

Superior (Cephalad)

Toward the head or the upper part of the body.

Inferior (Caudal)

Away from the head end or toward the lower part of the body.

Anterior (Ventral)

Toward the front of the body.

Posterior (Dorsal)

Toward the back of the body.

Supine

The position of lying face upward.

Prone

The position of lying face downward.

Medial

Toward the midline of the body.

Lateral

Away from the midline of the body.

Proximal

Close to the origin of the body or the point of attachment.

Distal

Farther from the origin or the point of attachment.

Superficial

Located on or near the surface of the body.

Deep

Located away from the body surface; more internal.

Sagittal Plane

An imaginary vertical plane that passes through the body and separates it into left and right portions.

Median Plane

A specific sagittal plane that divides the body into equal right and left halves.

Transverse (Horizontal) Plane

A plane that divides the body into superior and inferior portions.

Frontal (Coronal) Plane

A plane that divides the body into anterior and posterior parts.

Integumentary System

Provides protection, regulates temperature, and prevents water loss; consists of skin, hair, nails, and sweat glands.

Skeletal System

Provides protection and support, allows movements, and produces blood cells; consists of bones, cartilages, ligaments, and joints.

Muscular System

Produces body movements, maintains posture, and produces body heat; consists of muscles attached to the skeleton by tendons.

Lymphatic System

Removes foreign substances from blood and lymph, combats disease, and maintains tissue fluid balance.

Respiratory System

Exchanges oxygen and carbon dioxide between the blood and air and regulates blood pH; consists of lungs and respiratory passages.

Digestive System

Performs mechanical and chemical processes of digestion, absorption of nutrients, and elimination of wastes.

Nervous System

A major regulatory system that detects sensations and controls movements, physiological processes, and intellectual functions.

Endocrine System

A major regulatory system that influences metabolism, growth, and reproduction through glands that secrete hormones.

Cardiovascular System

Transports nutrients, waste products, gases, and hormones; plays a role in immune response and temperature regulation.

Urinary System

Removes waste products from the blood and regulates blood pH, ion balance, and water balance.