Anatomy & Physiology: The Human Body – An Orientation

Introduction to Anatomy and Physiology

Why This Matters

Learning and understanding anatomical terminology is essential for effective communication among health science professionals. Precise terminology ensures clarity and accuracy in describing body structures and functions.

Form and Function of Anatomy & Physiology

Definitions

• Anatomy: The study of the structure of body parts and their relationships to one another.

• Physiology: The study of the function of body parts; specifically, how they work to carry out life-sustaining activities.

Both disciplines are closely linked, as the structure of a body part often determines its function.

Divisions of Anatomy

Macroscopic (Gross) Anatomy

• Gross or macroscopic anatomy: Study of large, visible structures.

• Regional anatomy: Examines all structures in a particular area of the body.

• System anatomy: Focuses on one organ system (e.g., cardiovascular, nervous, muscular).

• Surface anatomy: Studies internal structures as they relate to the overlying skin (e.g., visible muscle masses or veins).

Microscopic Anatomy

• Microscopic anatomy: Deals with structures too small to be seen with the naked eye.

• Cytology: The microscopic study of cells.

• Histology: The microscopic study of tissues.

Developmental Anatomy

• Developmental anatomy: Studies anatomical and physiological development throughout life.

• Embryology: Study of developmental changes before birth.

To study anatomy, one must be familiar with anatomical terminology and be able to observe, palpate, and auscultate.

Divisions of Physiology

Overview

• Organ system-based physiology: Focuses on specific organ systems (e.g., renal physiology, cardiovascular physiology).

• Cellular and molecular physiology: Examines how the body's abilities depend on chemical reactions within individual cells.

Studying physiology requires understanding basic physical principles (such as electrical currents, pressure, and movement) and basic chemical principles.

Complementarity of Structure and Function

Principle of Complementarity

• Anatomy and physiology are inseparable: The function of a body part always reflects its structure.

• Specific form determines function: What a structure can do depends on its specific form.

• Principle of complementarity: Structure and function are interdependent.

Example: Teeth Structure and Function

• Incisors: The sharp edges (structure) make them ideal for cutting like scissors (function).

• Molars: The flat surfaces (structure) make them ideal for grinding, like a mortar and pestle (function).

Additional info: This principle applies throughout the body, from the microscopic level (cell shape and function) to the macroscopic level (organ structure and function).