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

19. The Blood Vessels

Veins

Anatomy & Physiology

19. The Blood Vessels

Veins

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Multiple Choice

A major difference between venules and arterioles is that:

The smallest arterioles consist of only one layer (tunic), while the smallest venules have all 3 layers (tunics).

Some arterioles make direct contact with capillaries, but no venules do.

Arterioles deliver blood to capillaries while venules collect blood from capillaries.

Arterioles collect blood from capillaries while venules deliver blood to capillaries.

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Verified step by step guidance

Understand the basic function of arterioles and venules in the circulatory system. Arterioles are small branches of arteries that lead to capillaries, while venules are small vessels that collect blood from capillaries and lead to veins.

Recognize the structural differences between arterioles and venules. Arterioles have thicker walls with more smooth muscle compared to venules, which have thinner walls and less smooth muscle.

Identify the direction of blood flow in the circulatory system. Blood flows from the heart through arteries to arterioles, then to capillaries, and from capillaries to venules, and finally to veins back to the heart.

Clarify the role of arterioles in delivering blood to capillaries. Arterioles regulate blood flow into capillaries through vasoconstriction and vasodilation, controlling blood pressure and flow.

Explain the role of venules in collecting blood from capillaries. Venules gather deoxygenated blood from capillaries and transport it to larger veins, which return it to the heart.