Which tissue lines the interior surface of blood vessels?

Which tissue lines the interior surface of blood vessels?

• A. Endothelium
• B. Keratinized squamous
• C. Mesothelium
• D. Simple cuboidal epithelium

Answer: (A)

The lining of the interior surface of blood vessels is made of endothelial tissue. This is a specialized simple squamous epithelium that forms the tunica intima, providing a very smooth surface to minimize friction as blood flows. The endothelium also plays active roles in regulating permeability, vascular tone, and clotting, making it essential for vessel function. Keratinized squamous epithelium is found on the skin surface, not inside blood vessels. Mesothelium lines the body’s serous cavities (like the lining around the lungs and heart), not the vessel interiors. Simple cuboidal epithelium lines many glands and kidney tubules, not blood vessel linings.

The lining of the interior surface of blood vessels is made of endothelial tissue. This is a specialized simple squamous epithelium that forms the tunica intima, providing a very smooth surface to minimize friction as blood flows. The endothelium also plays active roles in regulating permeability, vascular tone, and clotting, making it essential for vessel function.

Keratinized squamous epithelium is found on the skin surface, not inside blood vessels. Mesothelium lines the body’s serous cavities (like the lining around the lungs and heart), not the vessel interiors. Simple cuboidal epithelium lines many glands and kidney tubules, not blood vessel linings.