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.
Frequently asked questions
What is the correct answer to this question?
To prevent the backward flow of blood
Why is this the correct answer?
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.
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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