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The wall of a blood capillary is composed of

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endothelium only

endothelium and basement membrane

endothelium and muscle fibres

tunica externa, tunica media and tunica interna

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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