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What is the main reason for valves in veins?

Answer and explanation

Correct answer: To prevent the backward flow of blood

The governing concept is one-way movement of blood under relatively low pressure. Veins return blood toward the heart, and skeletal-muscle movement can help push that blood forward. Because venous pressure is low, blood could fall backward, especially in limbs; valves close to stop reverse flow. Therefore A is correct, while B, C and D describe unrelated processes.

Related tags

VeinsValvesBlood-FlowLife ProcessesWorld Of LivingScienceClass 10 Mcq

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