NEET PG DENTAL EXAM

Detailed explanation-1: -The endothelial cells form a one-cell thick walled layer called endothelium that lines all of our blood vessels such as arteries, arterioles, venules, veins and capillaries.

Detailed explanation-2: -Capillaries are the connection of the smallest branches of arteries and veins. The capillary walls are one cell thick. Capillaries allow molecules to pass through across the capillary walls. This exchange of materials is not possible across the walls of other types of blood vessels because the walls are too thick.