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WHAT IS VALVE

 

Hello,

@Sriram, your friends have answered your question correctly. Hope you got it. 

@Hello and Pornima, very good. Keep it up!

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valves are doors of the veins.i mean to say they prevent backward flow of the blood.

hope it would help & if you like please give me a thumbs up.

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doors of both veins n arteries 

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valves r the wall or a muscular thing which allows  blood 2 flow in 1 direction !!!

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vavles help by let the blood flow in one direction.

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the passage through which  let the blood to flow in a direction &does not let it to return back.
pls give me a Thumbs Up !
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no.they are of just veins.

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