In veins, valves are present to check backward flow of blood flowing at:
Correct answer: C. Low pressure
- A. Atmospheric pressure
- B. High pressure
- C. Low pressure
- D. All of these
Explanation
Veins carry blood at low pressure as compared to blood carried by arteries. Arteries carry blood from the heart whose function is to pump blood at high pressure so that blood can reach each and every part of the body. Veins carry blood from tissues to the heart, so they carry blood at low pressure.Valves are present in the veins to prevent backflow of blood due to 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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