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 not a reason that veins need valves to prevent backflow, but arteries do not?

Arteries have thicker walls than veins, providing a natural resistance to backflow.

Veins require valves to prevent gravity from causing backflow when blood is transported up to the heart.

Arteries have higher blood pressure, reducing the likelihood of backflow when they transport blood upward.

All of the above are correct reasons for veins requiring valves.

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Verified step by step guidance

Understand the function of valves in veins: Valves in veins are crucial for preventing the backflow of blood, especially when blood is moving against gravity, such as from the lower extremities back to the heart.

Consider the structural differences between arteries and veins: Arteries have thicker walls compared to veins, which helps them withstand higher blood pressure and reduces the risk of backflow.

Analyze the role of blood pressure: Arteries operate under higher blood pressure, which naturally propels blood forward, minimizing the need for valves to prevent backflow.

Evaluate the impact of gravity on veins: Veins, especially those in the lower body, are more susceptible to the effects of gravity, which can cause blood to flow backward. Valves help counteract this effect.

Review the options provided: Determine which statement does not apply to arteries needing valves by considering the structural and functional differences between arteries and veins.