Valves are found in veins to check the backfl | vedclass

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(A) Veins carry blood from the tissues back to the heart. Since the blood in the veins is moving away from the heart and has already passed through th

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Low pressure

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(A) Veins carry blood from the tissues back to the heart. Since the blood in the veins is moving away from the heart and has already passed through the capillary beds,it flows under low pressure. To ensure that blood flows in only one direction towards the heart and to prevent the backflow of blood due to gravity or other factors,veins contain valves. Therefore,valves are present in veins to check the backflow of blood flowing under low pressure.

Column-$A$	Column-$B$
$(1)$ Aorta	$(A)$ Carries deoxygenated blood from the heart to lungs
$(2)$ Capillaries	$(B)$ Largest blood vessel
$(3)$ Pulmonary artery	$(C)$ Tiny blood vessels where exchange of gases occurs
$(4)$ Veins	$(D)$ Blood vessels that carry blood back to heart

Valves are found in veins to check the backflow of blood flowing under

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