What is the inner space of blood vessels called?

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Multiple Choice

What is the inner space of blood vessels called?

The inner space of a blood vessel is called the lumen. It’s the hollow channel through which blood travels, lined by endothelial cells forming the tunica intima. Surrounding it are the wall layers—the muscular middle layer that helps regulate diameter and the outer connective tissue layer that provides support—yet these are not the space itself. The other options refer to parts of the vessel wall or to pathogens, not to the interior hollow space.

The inner space of a blood vessel is called the lumen. It’s the hollow channel through which blood travels, lined by endothelial cells forming the tunica intima. Surrounding it are the wall layers—the muscular middle layer that helps regulate diameter and the outer connective tissue layer that provides support—yet these are not the space itself. The other options refer to parts of the vessel wall or to pathogens, not to the interior hollow space.

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