Semilunar valves are not present:
Correct answer: D. In the coronary arteries
- A. At the base of the pulmonary trunk
- B. At the base of the aorta
- C. In veins
- D. In the coronary arteries
Explanation
Arteries don't require valves because pressure from the heart is so strong that blood is only able to flow in one direction.
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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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