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 Heart2h 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

Exchange of gases and nutrients occurs by diffusion between the __________.

arterioles and tissue cells

artery walls and tissue cells

arterioles and venules

arteries and veins

capillaries and tissue cells

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Verified step by step guidance

Understand the role of capillaries in the circulatory system. Capillaries are small blood vessels where the exchange of gases, nutrients, and waste products occurs between the blood and tissue cells.

Recognize that capillaries have thin walls, consisting of a single layer of endothelial cells, which facilitates the diffusion process.

Identify the process of diffusion, which is the movement of molecules from an area of higher concentration to an area of lower concentration. This is how oxygen and nutrients move from the blood in the capillaries to the tissue cells.

Consider the structure of the circulatory system: arteries carry blood away from the heart, arterioles are smaller branches of arteries, and capillaries connect arterioles to venules, which then lead to veins that return blood to the heart.

Conclude that the exchange of gases and nutrients primarily occurs at the capillary level, where the blood is in close proximity to tissue cells, allowing for efficient diffusion.