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

Introduction to Blood Vessels

Anatomy & Physiology

19. The Blood Vessels

Introduction to Blood Vessels

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Multiple Choice

Which of the following best describes true capillaries?

They are vessels that return blood directly to the heart.

They are large vessels that carry blood away from the heart.

They are the smallest blood vessels where exchange of gases, nutrients, and wastes occurs.

They are vessels that contain valves to prevent backflow of blood.

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Verified step by step guidance

Understand the role of capillaries in the circulatory system: Capillaries are the smallest blood vessels in the body and are responsible for the exchange of gases (oxygen and carbon dioxide), nutrients, and waste products between the blood and surrounding tissues.

Compare the function of capillaries to other types of blood vessels: Arteries carry blood away from the heart, veins return blood to the heart, and capillaries connect arteries and veins while facilitating exchange processes.

Identify the structural features of capillaries: Capillaries have thin walls composed of a single layer of endothelial cells, which allow for efficient diffusion of substances between the blood and tissues.

Eliminate incorrect options based on the description: Capillaries do not contain valves (a feature of veins), nor are they large vessels like arteries or veins. They are specialized for exchange rather than transport.

Select the correct answer: The statement 'They are the smallest blood vessels where exchange of gases, nutrients, and wastes occurs' best describes true capillaries based on their structure and function.