Q.

The wall of a blood capillary is composed of

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a

tunica externa, tunica media and tunica interna

b

endothelium and basement membrane

c

endothelium and muscle fibres

d

endothelium only

answer is B.

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Detailed Solution

Blood capillaries lack tunica media and tunica externa. Capillary walls are composed of only a single layer of endothelial cells and a basement membrane. 

This facilitates the exchange of materials occurs through the walls of capillaries.

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