A very thick connective tissue sheath, primarily composed of collagen fibers with scattered bands of elastic fibers, that blends into the surrounding tissues and assists in anchoring the blood vessel, is (the)

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The adventitia is a thick connective tissue sheath that surrounds blood vessels and provides support and stability to the vessel. It is primarily composed of collagen fibers with scattered bands of elastic fibers and helps anchor the blood vessel to surrounding tissues. The media is the middle layer of the blood vessel wall that contains smooth muscle cells and elastic fibers. The external elastic membrane is a layer that separates the media from the adventitia in larger blood vessels. The capillary wall is composed of a single layer of endothelial cells that allows for the exchange of gases and nutrients between the blood and tissues.

A Very Thick Connective Tissue Sheath, Primarily Composed of Collagen