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

Capillaries

Anatomy & Physiology

19. The Blood Vessels

Capillaries

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Multiple Choice

Which of the following is not true of capillaries?

Capillaries have thin walls to facilitate gas exchange.

Capillaries have a thick muscular layer to regulate blood flow.

Capillaries connect arterioles and venules.

Capillaries are the site of nutrient and waste exchange between blood and tissues.

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Verified step by step guidance

Understand the structure and function of capillaries: Capillaries are the smallest blood vessels in the body, and their primary function is to facilitate the exchange of gases, nutrients, and waste products between the blood and surrounding tissues.

Analyze the statement about capillary walls: Capillaries have thin walls, typically one cell layer thick, which allows for efficient diffusion of gases and nutrients. This statement is true.

Evaluate the statement about capillaries connecting arterioles and venules: Capillaries serve as a bridge between arterioles (small arteries) and venules (small veins), allowing blood to flow from the arterial to the venous system. This statement is true.

Consider the statement about nutrient and waste exchange: Capillaries are indeed the primary site for the exchange of nutrients and waste products between the blood and tissues, due to their thin walls and extensive network. This statement is true.

Assess the statement about a thick muscular layer: Capillaries do not have a thick muscular layer; instead, they have a single layer of endothelial cells. The presence of a thick muscular layer is characteristic of larger blood vessels like arteries. Therefore, this statement is not true of capillaries.