Which tunic is the innermost layer of a blood vessel?

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Study for the NHCO Phlebotomy Test. Experience flashcards and multiple-choice questions with hints and explanations. Prepare effectively for your phlebotomy exam!

Multiple Choice

Which tunic is the innermost layer of a blood vessel?

Explanation:
The innermost lining of a blood vessel is the tunica intima. This layer lines the lumen and is formed mainly by endothelial cells that create a smooth surface to minimize friction, helping blood flow and reducing the risk of clotting. In arteries you’ll also find the internal elastic lamina just outside the endothelium, contributing to the vessel’s elasticity. Outside the intima is the tunica media, the muscular middle layer that controls vessel diameter, and beyond that lies the tunica adventitia (externa), the outer connective tissue layer that anchors the vessel. So this innermost lining—tunica intima—is the correct choice.

The innermost lining of a blood vessel is the tunica intima. This layer lines the lumen and is formed mainly by endothelial cells that create a smooth surface to minimize friction, helping blood flow and reducing the risk of clotting. In arteries you’ll also find the internal elastic lamina just outside the endothelium, contributing to the vessel’s elasticity. Outside the intima is the tunica media, the muscular middle layer that controls vessel diameter, and beyond that lies the tunica adventitia (externa), the outer connective tissue layer that anchors the vessel. So this innermost lining—tunica intima—is the correct choice.

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