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15 June, 01:57

Which one of the following correctly lists the three layers of an arterial wall, beginning at the lumen and moving outward?

A. Tunica intima, tunica media, tunica adventitia B. Tunica intima, tunica muscularis, tunica externis C. Tunica inner, tunica middle, tunica external D. Endothelium, circular muscle, longitudinal muscle

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  1. 15 June, 04:05
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    A - Tunica intima, tunica media, tunica adventitia.

    Tunica intima

    Is the internal layer of the arterial wall, it is a sqaumous epithelium which is surrounded by connective tissue and elastic fibre, it provides a one way flow of blood.

    Tunica media

    The middle layer is made of smooth muscles and is the thickest layer that changes the arteries diameter controlling blood pressure and flow.

    Tunica adventitia

    A dense outer layer of the arterial wall made of connective tissue. It consist of collagen fiber and provides protection to the blood vessel.
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