Question

The internal lining of blood vessels is called:

• A. Mesothelium
• B. Endothelium
• C. Pavement epithelium
• D. Stratified epithelium

Answer 1

The correct option is B Endothelium

The internal lining of blood vessels is called the endothelium, which is the thin layer of simple squamous cells, that lines the interior surface of blood vessels and lymphatic vessels. The cells that form the endothelium are called endothelial cells. These cells are in direct contact with blood and are called vascular endothelial cells, whereas those in direct contact with lymph are known as lymphatic endothelial cells.

So, the correct option is B.