D203 Fundamentals of Anatomy and Physiology Exam

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  • Cellular Foundations: Cell structure, function, and communication.
  • Organ Systems: Detailed coverage of the cardiovascular, respiratory, nervous, and musculoskeletal systems.
  • Physiological Regulation: Mechanisms of homeostasis and hormonal control.
  • Pathophysiology: Common diseases and disorders associated with organ systems.

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Comprehensive Guide for the WGU Fundamentals of Anatomy and Physiology D203 Exam

1. Introduction to Anatomy and Physiology

  • Definition: Anatomy refers to the study of the structure of the body and its parts, while physiology is the study of how these structures function. Together, they provide a comprehensive understanding of the human body.

  • Purpose and Goals: The goal is to understand the relationship between body structures and their functions, which is essential for diagnosing, treating, and preventing diseases.

  • Characteristics:

    • Interconnectedness: Every part of the body is connected and works together to maintain homeostasis.

    • Organization: The body is organized into several levels of complexity, from cells to tissues, organs, and systems.

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

  • Example: The heart (anatomy) pumps blood through the circulatory system, which provides oxygen and nutrients to tissues (physiology), demonstrating how structure and function are intertwined.

2. Levels of Structural Organization

  • Chemical Level: Involves atoms and molecules, the building blocks of the body. For example, water, proteins, and carbohydrates.

  • Cellular Level: Cells are the basic structural and functional units of the body. Each cell has a specific function that contributes to the overall body function.

  • Tissue Level: Groups of similar cells that perform a common function. Examples include epithelial, connective, muscle, and nervous tissues.

  • Organ Level: Composed of two or more tissues working together to perform specific functions. For example, the heart is made up of muscle tissue, connective tissue, and nervous tissue.

  • Organ System Level: A group of organs working together to perform a vital function. For example, the cardiovascular system includes the heart and blood vessels.

  • Organism Level: The human body as a whole, made up of various systems working together to maintain health and homeostasis.

3. Body Systems Overview

  • Integumentary System: Includes the skin, hair, nails, and sweat glands. Protects the body, regulates temperature, and provides sensory information.

  • Skeletal System: Composed of bones, cartilage, ligaments, and joints. Provides support, protection, and movement, as well as the production of blood cells.

  • Muscular System: Includes skeletal muscles, tendons, and ligaments. Responsible for body movement and the maintenance of posture.

  • Nervous System: Consists of the brain, spinal cord, and nerves. Controls and coordinates body activities, including sensory input and motor output.

  • Endocrine System: Glands that secrete hormones, which regulate various bodily functions such as metabolism, growth, and reproduction.

  • Cardiovascular System: The heart and blood vessels. Transports oxygen, nutrients, and wastes throughout the body.

  • Lymphatic/Immune System: Includes lymph nodes, spleen, and lymph vessels. Plays a key role in defending the body against pathogens and maintaining fluid balance.

  • Respiratory System: Composed of the lungs and airways. Facilitates the exchange of gases (oxygen and carbon dioxide) between the body and the environment.

  • Digestive System: Includes the mouth, esophagus, stomach, intestines, and accessory organs like the liver. Breaks down food for nutrient absorption and waste elimination.

  • Urinary System: Includes the kidneys, ureters, bladder, and urethra. Filters waste from the blood and maintains electrolyte and fluid balance.

  • Reproductive System: Includes male and female organs that function in the production of offspring.

4. Cells and Tissues

  • Cell Structure: Cells are made up of various organelles (e.g., nucleus, mitochondria, ribosomes) that perform specific functions. For example, the mitochondria provide energy to the cell.

  • Tissues:

    • Epithelial Tissue: Covers body surfaces and lines cavities. It protects, secretes, absorbs, and excretes.

    • Connective Tissue: Supports, binds, and connects body structures. Examples include bone, blood, and adipose tissue.

    • Muscle Tissue: Responsible for movement. It includes skeletal, smooth, and cardiac muscles.

    • Nervous Tissue: Transmits electrical signals. It is found in the brain, spinal cord, and nerves.

5. Homeostasis and Feedback Mechanisms

  • Homeostasis: The body’s ability to maintain stable internal conditions such as body temperature, blood pressure, and pH levels.

  • Negative Feedback: A process that reverses a change in a controlled condition. For example, when the body temperature rises, mechanisms are triggered to cool the body down (sweating, vasodilation).

  • Positive Feedback: A process that enhances or amplifies the change in a controlled condition. An example is the release of oxytocin during childbirth, which intensifies contractions.

6. Body Cavities and Membranes

  • Dorsal Body Cavity: Contains the cranial cavity (brain) and spinal cavity (spinal cord).

  • Ventral Body Cavity: Divided into the thoracic cavity (lungs and heart) and abdominopelvic cavity (digestive organs, kidneys, bladder, reproductive organs).

  • Serous Membranes: Double-layered membranes that line body cavities and cover organs, providing lubrication. Examples include the pericardium (heart), pleura (lungs), and peritoneum (abdominal organs).

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