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If valves in veins do not work properly, what problem is most likely?

Answer and explanation

Correct answer: Backflow or pooling of blood

Veins carry blood back to the heart, often from body regions below the heart where gravity opposes upward movement. Their valves normally open in the forward direction and close when blood tends to reverse. If the valves fail, blood can flow backward and accumulate, or pool, in the veins. Option A therefore follows directly from the structure-function relationship. The other choices concern plants or digestion and have no connection with venous valves.

Related tags

VeinsVenous-ValvesBlood-PoolingCirculationLife ProcessesWorld Of LivingScienceClass 10 Mcq

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