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It lines the lumen of the vessels, and is a thin layer of endothelium.
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∙ 14y ago
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Which tunic of the artery contains endothelium?
tunica media
The tunica interna is continuous with this layer of the heart?
Endocardium
Why does the tunica interna exhibit folds?
These are venous valves.
What are the layers that make up the veins?
the layers that make up the heart are the tunica externa, tunica media, and tunica interna.
What is the innermost layer of a blood vessel composed of endothelial cells?
Tunica interna
Why does tunica interna of the vasoconstricted section of the arteriole exhibit folds?
These are venous valves.
Which layer of the artery wall thickens most in atherosclerosis?
The tunica media is the thickest layer of of an artery
Which blood vessel tunic is composed of smooth muscle and controls the diameter of the vessel?
Tunica interna
The structure of a capillary wall differs from that of vein or artery because?
it has a single tunic- only the tunica interna
Why do arteries have the thickest walls?
Blood vessels are composed of three layers of tissue: tunica externa, tunica media, and tunica interna. The middle layer, tunica media, is composed of smooth muscle and is thickest in arteries because they need to accommodate the higher pressures created by the heart's pumping action which distributes blood throughout the body.
What are the characteristics of elastic arteries?
The tunica interna of an elastic artery has subendothelial laminas of elastic fibres. Its tunica media has many fenestrated elastic membranes alternating with smooth muscle fibres. An elastic artery also has external elastic lamina. Its tunica externa is thin and contains vasa vasorum.
Why does an artery have such a thick layer?
Arteries are not one cell thick. They are multicelluar in their formation. They contain three distinct layers; tunica interna (or intima made of endothelial tissue), tunica media (muscular tissue), and tunica externa (serous membrane).
