D203 Fundamentals of Anatomy and Physiology is a Western Governors University course giving an overview of the structures and functions of the body's organs and systems.
WGU describes it as exploring how body systems work together to produce movement, transport nutrients, eliminate wastes, protect vital organs, regulate bodily functions and support reproduction and growth. It carries three competency units in programs such as Health Information Management, Psychology and health and human services.
The challenge is volume. There are many structures to name, and the course expects you to connect each one to what it does and how it keeps the body in balance.
Course at a Glance
| Item | Details |
|---|---|
| University | Western Governors University (WGU) |
| Course code | D203 |
| Level | Undergraduate |
| Competency units | 3 |
| Learning format | Videos, readings, exploratory learning and practice activities |
| Typical work | Practice quizzes and a final assessment across four groups of systems |
What D203 Covers
The program guide groups the systems into four competencies:
| Competency group | Main roles |
|---|---|
| Endocrine and reproductive systems | Reproduction and hormonal control of homeostasis |
| Immune, integumentary systems and special senses | Protecting the body and sensing the environment |
| Muscular, skeletal and nervous systems | Movement and its control |
| Respiratory, cardiovascular, urinary and digestive systems | Transporting nutrients and removing waste |
Key Concepts Explained
Structure Fits Function
Anatomy is structure; physiology is function. The two explain each other. Thin alveolar walls in the lungs allow fast gas exchange; the thick muscular wall of the left ventricle generates the pressure to push blood around the body.
Homeostasis and Negative Feedback
Homeostasis is keeping internal conditions stable. Most control uses negative feedback: a change is detected and the body acts to reverse it.
Example: After a meal, blood glucose rises. The pancreas releases insulin, cells take up glucose and the liver stores it as glycogen, so glucose falls back towards normal. Between meals, glucagon has the opposite effect. Sensor, control center, effector, response: the same four steps work for body temperature and blood pressure.
Systems Working Together
Questions often cross systems. Movement needs the nervous system to signal, muscles to contract, bones as levers, and the cardiovascular and respiratory systems to deliver oxygen.
Typical Assignments and How to Approach Them
| Task type | What it tests | How to approach it |
|---|---|---|
| Labeling and identification | Naming structures | Learn structures in pathways (air, blood, food) rather than lists |
| Function questions | What each part does | Pair every structure with one verb: filters, pumps, secretes |
| Homeostasis scenarios | Feedback loops | Write sensor, control center, effector and response |
| Cross-system questions | Integration | Trace one process (exercise, digestion) through each system involved |
Learning the Body in Pathways
Lists of organs are hard to remember. Pathways turn them into a story, and they mirror how questions are often framed.
Example, the path of air: nose and nasal cavity (warm, filter, moisten) to pharynx, larynx and trachea, then bronchi and bronchioles, ending in the alveoli, where oxygen diffuses into the capillaries and carbon dioxide moves out. Learn each stop with one job, and the respiratory system is half learned.
The same method works for other systems:
- Blood through the heart: right atrium, right ventricle, lungs, left atrium, left ventricle, aorta.
- Food through the digestive tract: mouth, esophagus, stomach, small intestine, large intestine.
- Urine formation: kidneys filter blood, ureters carry urine to the bladder, the urethra empties it.
- A reflex: receptor, sensory neuron, spinal cord, motor neuron, muscle.
Where Students Get Stuck
- Memorizing without context. Names stick better when you know the job each part does.
- Blood flow through the heart. Practice the route aloud until you can draw it from memory.
- Hormones. Make a table of gland, hormone, target and effect.
- Directional terms. Learn anterior, posterior, proximal and distal early; questions assume them.
Study Tips for D203
- Study one competency group at a time and test yourself before moving on.
- Use flashcards with the structure on one side and its function on the other.
- Explain each feedback loop out loud as if teaching someone.
- Health information students: link structures to the medical terms you will meet in coding courses.
How We Help with D203
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Frequently Asked Questions
All the major ones, grouped into four competencies: endocrine and reproductive; immune, integumentary and special senses; muscular, skeletal and nervous; and respiratory, cardiovascular, urinary and digestive.
No. D203 is a single fundamentals overview. Some WGU programs, such as nursing, use separate lab-based anatomy and physiology courses instead.
The program guide describes videos, readings, exploratory learning and practice activities; it does not describe a lab component.
Learn each structure with its function, use pathways instead of lists, and test yourself with scenario questions.
Because almost every system helps keep internal conditions stable, so feedback loops connect the whole course.
No. We help you learn the material so you can complete the assessment yourself.