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.
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What is the correct answer to this question?
Backflow or pooling of blood
Why is this the correct answer?
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.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: World of Living. Topic: Life Processes.
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