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Anatomy and Physiology Overview

  • Anatomy: The study of form and structure of body parts and their relationships.

  • Physiology: The study of the function of body parts.

Types of Anatomy

  • Gross Anatomy: Structures large enough to be seen with the naked eye. Examples include:

    • Brain

    • Heart

    • Stomach

  • Microscopic Anatomy: Structures too small to be seen with the naked eye, studied via microscopes.

    • Cytology: Study of individual cells.

    • Histology: Study of tissues.

    • Tools for study include compound light microscopes, dissecting microscopes, and electron microscopes.

Subdivisions of Gross Anatomy

  • Regional Anatomy: Study of specific regions of the body (e.g., abdominal cavity).

  • Surface Anatomy: Study of internal structures as they relate to the skin surface.

  • Systemic Anatomy: Focus on organ systems in the body.

Physiology Focus

  • Physiology deals with the functions of each of the organ systems. Subfields include:

    • Cell Physiology: Functions of cell processes.

    • Immunology: Study of the immune response.

    • Renal Physiology: Functions of the kidneys.

    • Cardiovascular Physiology: Study of heart and blood vessels.

Basic Principles of Cell Theory

  • Cells are the basic building blocks of life for all organisms.

  • Cells are produced through the division of pre-existing cells.

  • The cell is the smallest structural unit that performs vital functions.

Levels of Organization in Biology

  1. Molecular Level: Atoms (e.g., hydrogen, oxygen).

  2. Cellular Level: Organelles and cells functioning together.

  3. Tissue Level: Groups of similar cells with a common function (e.g., muscle tissue).

  4. Organ Level: Two or more different tissues working together (e.g., heart).

  5. Organ System: Groups of organs working closely together (e.g., digestive system).

  6. Organism Level: All body systems working to maintain homeostasis.

Major Organ Systems and Their Functions

  • Lymphatic System: Facilitates immune responses and transports lymph.

  • Respiratory System: Exchange of gases (oxygen and carbon dioxide) between air and blood.

  • Muscular System: Movement, support, and blood heat production.

  • Nervous System: Coordinates body responses to stimuli.

  • Integumentary System: Provides external protection and regulates temperature.

  • Skeletal System: Structural support and framework for movement; forms blood cells.

  • Endocrine System: Regulates body functions through hormone secretion.

  • Cardiovascular System: Internal transport system for nutrients and gases.

  • Digestive System: Nutrient absorption and waste elimination.

  • Urinary System: Filters blood and maintains electrolyte balance.

  • Reproductive System: Production of gametes and hormones.

Characteristics of Living Organisms

  • Responsiveness: Ability to detect and respond to stimuli.

  • Growth and Development: Increase in size and complexity.

  • Reproduction: Ability to produce progeny.

  • Movement: Distribution of materials and organismal movement.

  • Respiration: Intake of oxygen and removal of carbon dioxide.

  • Circulation: Movement of fluids within the body.

  • Digestion: Breakdown and absorption of nutrients.

  • Homeostasis: Regulation of internal conditions for stability.

Homeostasis

  • Definition: Ability of the body to maintain a stable internal environment despite changes in external conditions.

  • Components: Includes sensors (receptors), control center, and effectors (muscles or glands).

  • Feedback Systems:

    • Negative Feedback: Counteracts changes to maintain balance (e.g., blood temperature regulation).

    • Positive Feedback: Enhances original stimulus (e.g., childbirth contractions).

Anatomical Terminology

  • Anatomical Position: Body standing upright, feet at shoulder width, and arms at sides with palms forward.

  • Directional Terms:

    • Anterior (ventral): Front

    • Posterior (dorsal): Back

    • Superior (cranial): Above

    • Inferior (caudal): Below

    • Medial: Toward midline

    • Lateral: Away from midline

    • Proximal: Closer to trunk

    • Distal: Farther from trunk

Body Cavities

  • Dorsal Body Cavity: Cranial and vertebral cavities.

  • Ventral Body Cavity: Thoracic cavity, abdominal cavity, and pelvic cavity, housing most organs.

  • Serous Membranes: Double layered membranes lining body cavities, containing lubricating fluid.

Medical Imaging Techniques

  • X-ray: High-energy radiation for viewing bones.

  • CT scan: Transverse imaging for detailed internal structures.

  • MRI: Uses magnetic fields for soft tissue imaging.

  • PET scan: Shows organ activity through blood flow.

  • Ultrasound: Non-invasive, often used in monitoring pregnancies.