There are no valves in:
Correct answer: C. Arteries and capillaries
- A. Arteries
- B. Capillaries
- C. Arteries and capillaries
- D. Veins
Explanation
The pumping pressure of heart does not allows blood to move backward in these two types of vessels.
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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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