why do capillaries in a human body do not have any valves.
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From the arteries, the entry of blood occurs in the capillaries which happens by the pressure of blood. Then it enters the veins. From here, the blood enters to the heart's right side. It is clear that the blood travels because of pressure of blood so there is no requirement of valves in the capillaries
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It is because capillaries have blood running through them in high pressure so there is no risk of backflow hence a valve is not needed.
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