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GCSE Biology 2020-2022 OCR Gateway

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Question:

How does cross section area of vessels affect the blood flow?

Author: go kys



Answer:

When the cross section increases, the velocity of the blood decreases. So capillaries slow it down not for a bad reason, but a good one. In the capillary beds, the blood flow is slow which allows the exchange of materials. If it had the same velocity as arteries, nothing would be diffuesed. Artieries have the highest velocity as its closer to the heart.


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go kys
go kys