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hram777 [196]
3 years ago
9

Explain how valves help the transport of blood in veins.

Biology
1 answer:
pychu [463]3 years ago
4 0

Answer:

The valves' main job is to keep the blood moving in one direction – back up towards the heart. When the valve is open, blood freely flows upward towards the heart and when the valves are closed, blood cannot flow back

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