Biology, asked by sangeetasharma27084, 8 months ago

veins have __________,a modified device which controls the back flow of blood​

Answers

Answered by mansigayu
0

Answer:

Veins have flap which controls the back flow of the blood. It brings the blood from the lungs to heart.

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Answered by emreen
0
Veins have Valves in them to prevent it
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