4. Why are veins provided with valves?

1.	4. Why are veins provided with valves?
Answer» to prevent the back flow of blood The main function of thevalvesinveinsis to prevent back flow of blood. Explanation:It is the veins further away from the heart in the lower limbs that have valves. This is to ensure that blood only flows in one direction ie back to the heart. This system of valves is need to overcome the effect of gravity working against the upward flow of venous blood. From which book have you taken this question? Please tell us so that we can provide you faster answer. To prevent the back flow of blood veins are provided valves.

Answer»

to prevent the back flow of blood

The main function of thevalvesinveinsis to prevent back flow of blood.

Explanation:It is the veins further away from the heart in the lower limbs that have valves. This is to ensure that blood only flows in one direction ie back to the heart. This system of valves is need to overcome the effect of gravity working against the upward flow of venous blood.

From which book have you taken this question? Please tell us so that we can provide you faster answer.

To prevent the back flow of blood veins are provided valves.

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