Question

what would happens if values are absent in veins​

Answer 1

Answer:

If valves were absent in vein, then the blood flow backwards (as the valves prevent the back flow of blood) and the circulatory system will not function efficiently.

Answer 2

Answer:

Valves are responsible for blood circulation, an absence of valves will make the circulation highly inefficient. Blood in the veins is under much lower pressure when it returns from the different organs and tissues to the heart and hence has a chance of reverse flow if the valves are not there to avoid it.

hope this will help you