Which of the following blood vessel(s) has/have valves, which prevents backward flow of blood?
Correct answer: C. Vein
- A. Artery
- B. Capillary
- C. Vein
- D. All of the above
Explanation
Unlike arteries, veins contain valves that ensure blood flows in one direction only. Arteries don't require valves because pressure from the heart is so strong that blood is only able to flow in one direction. Valves also help blood travel back to the heart against the force of gravity.
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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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