angie0928ag
04.09.2020 •
Biology
Explain how valves help the transport of blood in veins.
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Ответ:
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
Ответ:
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Explanation:
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