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

The atrioventricular valves permit blood flow in which direction within the heart?

From the atria to the ventricles

From the veins to the atria

From the ventricles to the arteries

From the ventricles to the atria

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Verified step by step guidance

Understand the anatomy of the heart: The heart has four chambers—two atria (upper chambers) and two ventricles (lower chambers). Blood flows in a specific direction to ensure efficient circulation.

Learn the function of atrioventricular (AV) valves: The AV valves are located between the atria and ventricles. The right AV valve is called the tricuspid valve, and the left AV valve is called the mitral valve. Their primary role is to prevent backflow of blood into the atria when the ventricles contract.

Identify the direction of blood flow: Blood flows from the atria to the ventricles through the AV valves during diastole (when the heart relaxes). The valves open to allow this flow and close during systole (when the heart contracts) to prevent backflow.

Eliminate incorrect options: Blood does not flow directly from veins to atria (veins bring blood to the atria, but this is not the role of AV valves). Blood does not flow from ventricles to arteries through AV valves (this occurs through semilunar valves). Blood does not flow from ventricles to atria through AV valves (this would indicate backflow, which the valves prevent).

Conclude the correct answer: The atrioventricular valves permit blood flow from the atria to the ventricles, ensuring proper circulation within the heart.