Human Anatomy and Physiology: Chapter 1 - The Human Body: An Orientation

Anatomy studies body structures and their relationships, while physiology focuses on their functions to sustain life. Anatomical sub-disciplines include:

  • Gross Anatomy: Visible structures (e.g., regional, system, and surface anatomy).

  • Microscopic Anatomy: Structures only visible with a microscope (cytology and histology).

  • Developmental Anatomy: Changes throughout the life cycle, such as embryology. Essential skills include anatomical terminology and methods like palpation and auscultation. Physiology is categorized by organ systems and important for understanding biochemical processes. Essential knowledge in physical and chemical principles is necessary. The principle of complementarity asserts that function relates to structure in biology.

Eight Necessary Life Functions:

  1. Maintaining Boundaries

  2. Movement

  3. Responsiveness

  4. Digestion

  5. Metabolism

  6. Excretion

  7. Reproduction

  8. Growth

Cellular Needs and Organ Systems: Organ systems are vital for cellular function, including the integumentary, skeletal, muscular, lymphatic, respiratory, digestive, nervous, endocrine, cardiovascular, urinary, and reproductive systems.
Survival Needs: Survival relies on nutrients, oxygen, water, normal temperature, and pressure.
Homeostasis: Defined as internal stability against external changes, using control systems that include receptors, control centers, and effectors. Negative feedback mechanisms maintain homeostasis through systems like temperature regulation, while positive feedback amplifies changes during specific processes like childbirth.