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

Which of the following is true of veins?

Veins carry blood away from the heart.

Veins have thicker walls than arteries.

Veins are primarily responsible for oxygenating blood.

Veins contain valves to prevent backflow of blood.

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Verified step by step guidance

Understand the function of veins in the circulatory system: Veins are blood vessels that carry blood towards the heart. This is the opposite of arteries, which carry blood away from the heart.

Consider the structure of veins: Veins have thinner walls compared to arteries. This is because the blood pressure in veins is lower than in arteries, so they do not need to be as thick or muscular.

Evaluate the role of veins in oxygenation: Veins are not responsible for oxygenating blood. This process occurs in the lungs, where oxygen is exchanged for carbon dioxide in the blood.

Identify the unique feature of veins: Veins contain valves. These valves are crucial as they prevent the backflow of blood, ensuring it moves in one direction towards the heart, especially from the lower parts of the body against gravity.

Conclude with the correct statement: Based on the above analysis, the true statement about veins is that they contain valves to prevent backflow of blood.