Answers

2015-09-11T20:24:37+05:30
If valves in veins of legs fail to stop the flow of blood then the blood will again in direction of gravity and it will not reach heart
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2015-09-11T20:32:04+05:30
If valves in veins of legs fail to stop the flow of blood then it flows in the direction of blood gravity and it may not reach the heart.
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