Per NCERT, what are CAPILLARIES?
AThe largest arteries
BHeart valves
CLymph vessels only
DThe smallest blood vessels — walls one-cell thick, where exchange of substances between blood and tissue cells takes place
Answer & Solution
Correct answer: D. The smallest blood vessels — walls one-cell thick, where exchange of substances between blood and tissue cells takes place
Per NCERT §5.4.1, capillaries are 1-cell-thick smallest vessels — site of material exchange.
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