The exchange of substances between the tissue and blood vessels takes place only at the
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a
venules.
b
capillaries.
c
veins.
d
arterioles.
answer is B.
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Detailed Solution
Capillaries are made of just endothelium which is porous enough to allow exchange of substances between the interstitial fluid and the blood. Arteries and veins are thicker than the capillaries with three layers in the wall.