Which layer of the vessel wall contains smooth muscle fibers?

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Multiple Choice

Which layer of the vessel wall contains smooth muscle fibers?

Explanation:
Smooth muscle fibers are found in the tunica media, the middle layer of blood vessel walls. This layer houses concentric smooth muscle cells along with elastic fibers, giving vessels their contractile power to constrict or dilate and regulate blood pressure and flow. The innermost layer, the tunica intima, is lined by endothelium; the outer layer, the tunica adventitia, is mainly connective tissue. The internal elastic lamina is an elastic membrane within the media that separates it from the intima, not a muscular layer. So, the layer containing smooth muscle fibers is the media.

Smooth muscle fibers are found in the tunica media, the middle layer of blood vessel walls. This layer houses concentric smooth muscle cells along with elastic fibers, giving vessels their contractile power to constrict or dilate and regulate blood pressure and flow. The innermost layer, the tunica intima, is lined by endothelium; the outer layer, the tunica adventitia, is mainly connective tissue. The internal elastic lamina is an elastic membrane within the media that separates it from the intima, not a muscular layer. So, the layer containing smooth muscle fibers is the media.

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