The exchange of materials between blood and intestitial fluid occurs only at the
A
Veins
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B
Capillaries
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C
Arteries
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D
Arterioles
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Solution
The correct option is A Capillaries The capillaries are the terminal branches of the blood transport system. It has very thin endothelial lining for proper exchange of nutrients and gasses. The lumen of the capillaries is very small as blood flow is very slow here for maximum exchange process. The capillaries also lack thick muscular walls.