Question

what is vein and function

Answer 1

Veins are an important part of our circulatory system. They are responsible for returning deoxygenated blood back to the heart after arteries carry blood out. The vena cava is the largest vein in the body. Veins have much thinner walls than arteries.

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Answer 2

A vein is an elastic blood vessel that transports blood from various regions of the body to the heart. 
•veins are thin walled.
•They are superficial
•They carry blood to the heart i.e deoxygenated blood
•Valves are present...
I hope this is it.....