Which tissue lines the interior surface of the heart chambers and blood vessels, providing a smooth lining?

Which tissue lines the interior surface of the heart chambers and blood vessels, providing a smooth lining?

• A. Simple squamous epithelium
• B. Endothelium of blood vessel
• C. Stratified squamous epithelium
• D. Pseudostratified columnar epithelium

Answer: (B)

The inner lining of the heart and blood vessels is endothelium, a specialized simple squamous epithelium. This single, flat-cell layer forms a smooth, low-friction surface that helps blood flow smoothly and minimizes turbulence and clotting. The term endothelium of blood vessel specifically naming this lining reflects its location within the cardiovascular system, including heart chambers. While simple squamous epithelium describes the cell shape, it’s not as precise about where the tissue sits; stratified squamous epithelium would line areas subject to abrasion (like skin and mucosa) and pseudostratified columnar epithelium lines parts of the respiratory tract and certain ducts, not the interior surfaces of the heart and vessels.

The inner lining of the heart and blood vessels is endothelium, a specialized simple squamous epithelium. This single, flat-cell layer forms a smooth, low-friction surface that helps blood flow smoothly and minimizes turbulence and clotting. The term endothelium of blood vessel specifically naming this lining reflects its location within the cardiovascular system, including heart chambers. While simple squamous epithelium describes the cell shape, it’s not as precise about where the tissue sits; stratified squamous epithelium would line areas subject to abrasion (like skin and mucosa) and pseudostratified columnar epithelium lines parts of the respiratory tract and certain ducts, not the interior surfaces of the heart and vessels.