First slide

Double Circulation

Question

Tunica intima is made of

Moderate

A

squamous epithelium.
B

smooth muscle.
C

elastic fibres.
D

cuboidal epithelium.

Solution

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. The tunica media is comparatively thin in the veins.

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