A vein differs from an artery in having:
Correct answer: D. Valves control direction of blood flow towards heart
- A. Strong muscular walls
- B. Narrow lumen
- C. Valves control direction of blood flow opposite to heart
- D. Valves control direction of blood flow towards heart
Explanation
All the veins transport blood to the heart.
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About Circulation
The circulatory system covers the chambers, valves and conducting pathway of the human heart, along with the cardiac cycle and control of heartbeat. It compares arteries, veins and capillaries by structure and function, and explains how the lymphatic system returns tissue fluid, transports absorbed fats and supports immunity.
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