The Lumen of Every Blood Vessel is Lined by a Monolayer

Question

The lumen of every blood vessel is lined by a monolayer of what cell type?
A) platelets
B) fibroblasts
C) endothelial cells
D) erythrocytes
E) smooth muscle cells

Accepted Answer

Endothelial cells form a monolayer lining the interior surface of all blood vessels, providing a barrier and playing a crucial role in the regulation of vascular functions.