First slide

Double Circulation

Question

Blood capillaries are made of

Moderate

A

endothelium, connective tissue and muscle fibres
B

endothelium and muscle fibres
C

endothelium and Connective tissues
D

endothelium only

Solution

The walls of capillaries are made up of a thin cell layer called endothelium that's surrounded by another thin layer called a basement membrane.
Each artery and vein consists of three layers: an inner lining of squamous endothelium, the tunica intima, a middle layer of smooth muscle and elastic fibres, the tunica media, and an external layer of fibrous connective tissue with collagen fibres, the tunica externa.

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