Capillaries have thin walls that help them perform their main function. The best explanation for this is that (A) capillaries are the smallest vessels in the body. (B) thin walls are an adaptation that help diffusion. (C) blood flow in capillaries is under very low pressure. (D) thin walls maximise the surface area available for gas exchange.

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Capillaries have thin walls that help them perform their main function - HSC - SSCE Biology - Question 17 - 2016 - Paper 1

Question 17

Capillaries have thin walls that help them perform their main function. The best explanation for this is that (A) capillaries are the smallest vessels in the body.... show full transcript

Worked Solution & Example Answer:Capillaries have thin walls that help them perform their main function - HSC - SSCE Biology - Question 17 - 2016 - Paper 1

Step 1

Select the best explanation

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Answer

The best explanation for the thin walls of capillaries is found in option (B): thin walls are an adaptation that help diffusion. This is because the primary function of capillaries is to facilitate the exchange of materials such as oxygen and carbon dioxide between blood and tissues. Thin walls enhance this diffusion process by reducing the distance over which substances must travel.

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