The reason why the flow of blood through the capillaries is very slow is
A.
because the walls of Capillaries are very thick
B.
to avoid high blood pressure
C.
to ensure that the individual does not get dizzy
D.
Their large numbers and one cell-thick walls enables them to provide a large surface area through which materials can be exchanged between the blood and the body cells.
Correct Answer: Option D
Explanation
Their large numbers and one cell-thick walls enables them to provide a large surface area through which materials can be exchanged between the blood and the body cells.
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