Why are blood capillaries suitable for exchange of materials?
Answer and explanation
Correct answer: Their walls are very thin
Capillaries connect the smallest arteries to the smallest veins and form dense networks close to body cells. Their walls are only about one cell thick, so oxygen, carbon dioxide, nutrients, and wastes can pass across them over a short distance by diffusion. Their narrow diameter also slows the blood flow, allowing time for exchange. Hence option A is correct; the other statements misidentify their structure or function.
Frequently asked questions
What is the correct answer to this question?
Their walls are very thin
Why is this the correct answer?
Capillaries connect the smallest arteries to the smallest veins and form dense networks close to body cells. Their walls are only about one cell thick, so oxygen, carbon dioxide, nutrients, and wastes can pass across them over a short distance by diffusion. Their narrow diameter also slows the blood flow, allowing time for exchange. Hence option A is correct; the other statements misidentify their structure or function.
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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