Which among the following possess unidirectional valves?

Artery

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Vein

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Capillary

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Lymph vessels

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Solution

The correct option is B
Vein

The efficient transport of blood and lymph relies on competent intra-luminal valves that ensure unidirectional fluid flow through the vessels. The main function of the valves in veins is to prevent back flow of blood. Blood in the arteries, after being pumped by the heart, are under much higher pressure than blood in veins so there is no need for valves in arteries to prevent back flow.

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