Which term refers to the middle layer of a blood vessel?

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Multiple Choice

Which term refers to the middle layer of a blood vessel?

Explanation:
The middle layer is the tunica media. It’s mainly smooth muscle with some elastic fibers, which lets blood vessels constrict or dilate to adjust blood flow and pressure. The inner lining is called the tunica intima (endothelium), and the outer layer is the tunica adventitia (connective tissue). The lumen is the hollow space inside the vessel, not a wall layer. Vein and artery refer to vessel types, not the middle layer.

The middle layer is the tunica media. It’s mainly smooth muscle with some elastic fibers, which lets blood vessels constrict or dilate to adjust blood flow and pressure. The inner lining is called the tunica intima (endothelium), and the outer layer is the tunica adventitia (connective tissue). The lumen is the hollow space inside the vessel, not a wall layer. Vein and artery refer to vessel types, not the middle layer.

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