Skip to main content
Back

Introduction to Human Anatomy & Physiology: Principles, Body Organization, and Homeostasis

NotesPracticeVideo lessons

Study Guide - Smart Notes

Tailored notes based on your materials, expanded with key definitions, examples, and context.

Introduction to Anatomy & Physiology

Distinguishing Anatomy and Physiology

Anatomy and physiology are foundational sciences in understanding the human body. Anatomy is the study of the structure of body parts, while physiology focuses on how these parts function, especially in the context of movement (kinesiology).

  • Anatomy: Examines the physical structures (organs, tissues, cells).

  • Physiology: Investigates the mechanisms and processes that allow the body to function.

  • Kinesiology: Applies physiological principles to human movement.

  • Example: Studying the structure of the heart (anatomy) versus understanding how it pumps blood (physiology).

Learning and Memory in Anatomy & Physiology

Effective learning in anatomy and physiology requires active engagement and memory strategies.

  • Key strategies: Engage, read, review, practice, participate.

  • Application: Regular review and hands-on practice (e.g., lab work) enhance retention.

Course Learning Objectives

Major Issues and Structures in Neural Function

Understanding the cellular and structural basis of the nervous system is essential.

  • Central & Peripheral Nervous Systems: The CNS (brain and spinal cord) and PNS (nerves outside the CNS) coordinate body functions.

  • Muscular and Support Systems: Muscles and connective tissues interact with the nervous system for movement and stability.

Integrated Function of Body Systems

Body systems work together to maintain homeostasis and respond to stress.

  • System Interactions: Muscular, autonomic, and metabolic systems collaborate to regulate internal conditions.

  • Homeostasis: The body's ability to maintain a stable internal environment despite external changes.

  • Stress Adaptation: Physiological changes that help the body cope with stressors.

Aetiology of Disease and Health

Understanding the origins (aetiology) of disease and the impact of fitness and inactivity is crucial for health sciences.

  • Disease Modes: How diseases develop and affect body systems.

  • Fitness & Health: Regular activity promotes health; inactivity increases disease risk.

Major Cell and Tissue Types

Classification of Cells and Tissues

The human body contains over 200 cell types, grouped into four major tissue types, each with distinct functions.

  • Epithelial Tissue: Covers body surfaces and lines cavities; functions in protection, absorption, and secretion.

  • Connective Tissue: Supports, binds, and protects organs; includes bone, blood, and adipose tissue.

  • Muscle Tissue: Responsible for movement; includes skeletal, cardiac, and smooth muscle.

  • Nervous Tissue: Conducts electrical impulses; found in the brain, spinal cord, and nerves.

  • Example: Skin contains epithelial tissue (outer layer), connective tissue (dermis), muscle (arrector pili), and nervous tissue (sensory receptors).

Simplified Body Plan

The body is organized into compartments and systems, each with specialized functions.

  • Compartments: Regions separated by membranes (e.g., intracellular vs. extracellular spaces).

  • Organs: Structures composed of at least two tissue types, performing specific functions.

  • Organ Systems: Groups of organs working together for a particular task (e.g., digestive system).

Homeostasis

Definition and Importance

Homeostasis is the regulation of the internal environment to maintain stable, optimal conditions for survival.

  • Characteristics of Homeostatic Control Systems:

    • Sensor: Detects changes in the environment.

    • Integrator: Compares changes to a set point.

    • Effector: Initiates responses to restore balance.

  • Example: Regulation of body temperature via sweating or shivering.

Body Fluid Compartments

Organization and Transport

Body fluids are distributed in distinct compartments, separated by semipermeable membranes.

  • Intracellular Fluid (ICF): Fluid within cells; makes up about 2/3 of total body water.

  • Extracellular Fluid (ECF): Fluid outside cells; includes plasma and interstitial fluid, about 1/3 of total body water.

  • Transport: Movement of substances between compartments occurs via membranes.

Compartment

Approximate Volume (L)

Fraction of Total Body Water

Intracellular Fluid (ICF)

28

2/3

Extracellular Fluid (ECF)

14

1/3

Total Body Water (TBW)

42

1

Additional info: These values are for a typical 70 kg adult male; actual volumes vary with age, sex, and body composition.

Vocabulary: Word Roots in Anatomy & Physiology

Common Prefixes and Suffixes

Understanding word roots helps decode scientific terminology.

Word Root

Meaning

Example

intra-

inside

intravenous

inter-

between

intermission

extra-

outside, beyond

extraterrestrial

epi-

upon, over

epistasis

homeo-

same

homogeneous

-stasis

state

static

General Principles of Physiology

Integration and Regulation

Physiological processes are governed by the integration of organ systems and the laws of chemistry and physics.

  • Integration: Organ systems communicate and coordinate to maintain balance.

  • Opposing Systems: Many systems work in opposition (e.g., sympathetic vs. parasympathetic nervous system).

  • Material Exchange: Controlled exchange of substances across membranes is vital for function.

  • Chemical Laws: Transfer and balance of matter and energy are dictated by chemical principles.

Additional info: Examples include diffusion, osmosis, and active transport in cellular physiology.

Key Equation: Fluid Compartments

The distribution of body water can be represented as:

Where:

Pearson Logo

Study Prep