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 blood vessels have valves to prevent the backflow of blood?

Capillaries

Veins

Arteries

Arterioles

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Verified step by step guidance

Understand the function of blood vessels: Blood vessels are responsible for transporting blood throughout the body. They include arteries, veins, capillaries, and arterioles.

Identify the role of valves in blood vessels: Valves are structures that prevent the backflow of blood, ensuring it moves in one direction.

Recognize the types of blood vessels: Arteries carry blood away from the heart, veins carry blood back to the heart, capillaries are small vessels where gas exchange occurs, and arterioles are small branches of arteries.

Determine which vessels need valves: Veins, unlike arteries, are under lower pressure and often work against gravity, especially in the limbs. Therefore, they require valves to prevent backflow and ensure blood returns to the heart efficiently.

Conclude that veins have valves: Based on the need to prevent backflow and assist blood return to the heart, veins are the blood vessels that contain valves.