Question

what happened if there are no valve in human blood vessels​

Answer 1

Answer:

Regurgitation occurs when the valve doesn't close all the way. As a result, blood can flow backwards rather than being pumped out of the heart. The left ventricle has to work harder to pump the extra blood that has come back into the heart and, over time, it can thicken.

Explanation:

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Answer 2

Answer:

Valve prevents the blood from going in backward direction in human heart . If there were no valves blood would flow opposite direction .