Table of contents

1. Introduction to Anatomy & Physiology5h 43m
2. Cell Chemistry & Cell Components12h 36m
3. Energy & Cell Processes10h 6m
4. Tissues & Histology10h 3m
5. Integumentary System2h 20m
6. Bones & Skeletal Tissue2h 16m
7. The Skeletal System2h 35m
8. Joints2h 17m
9. Muscle Tissue2h 33m
10. Muscles1h 11m
11. Nervous Tissue and Nervous System1h 35m
12. The Central Nervous System1h 6m
- Introduction to the Central Nervous System
  18m
- The Cerebrum
  48m
13. The Peripheral Nervous System1h 26m
14. The Autonomic Nervous System1h 38m
15. The Special Senses2h 41m
16. The Endocrine System2h 48m
17. The Blood3h 22m
18. The Heart3h 42m
19. The Blood Vessels3h 35m
20. The Lymphatic System3h 16m
21. The Immune System14h 37m
22. The Respiratory System3h 20m
23. The Digestive System2h 5m
24. Metabolism and Nutrition4h 0m
25. The Urinary System2h 39m
26. Fluid and Electrolyte Balance, Acid Base Balance37m
27. The Reproductive System2h 5m
28. Human Development1h 21m
29. Heredity3h 32m

1. Introduction to Anatomy & Physiology

Introduction to Organ Systems

Anatomy & Physiology

1. Introduction to Anatomy & Physiology

Introduction to Organ Systems

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Multiple Choice

How do the walls of the atria compare with the walls of the ventricles, and why are they different?

The ventricular walls are thinner than the atrial walls because they receive blood from the body.

The atrial walls are thicker than the ventricular walls because they pump blood throughout the body.

The atrial walls are thinner than the ventricular walls because the atria only need to pump blood a short distance to the ventricles.

The atrial and ventricular walls are the same thickness because they perform similar functions.

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Verified step by step guidance

Understand the function of the atria and ventricles: The atria are responsible for receiving blood and pumping it a short distance to the ventricles, while the ventricles pump blood either to the lungs (right ventricle) or throughout the body (left ventricle).

Compare the workload of the atria and ventricles: The ventricles need to generate much more force to pump blood over longer distances, which requires thicker muscular walls compared to the atria.

Analyze the structural differences: The atrial walls are thinner because they only need to pump blood a short distance to the ventricles, whereas the ventricular walls are thicker to accommodate the higher pressure needed for systemic and pulmonary circulation.

Relate the differences to the circulatory system: The left ventricle has the thickest wall because it pumps blood to the entire body, while the right ventricle pumps blood to the lungs, requiring less force but still more than the atria.

Conclude why the atrial walls are thinner: The atria perform a less demanding function compared to the ventricles, which explains the structural differences in their walls.