Endothelium

Definition

The endothelium is a thin layer of simple squamous epithelial cells that lines the interior surface of blood vessels and lymphatic vessels, as well as the heart's inner chambers. It serves as a barrier and regulator for substances entering and exiting the bloodstream and plays a key role in vascular function and blood pressure regulation.

Related terms

Simple Squamous Epithelium: A single layer of flat cells in contact with the basal lamina, involved in diffusion, osmosis, filtration, secretion, or absorption.

Blood Vessels: Tubular structures carrying blood through the tissues and organs; a vein, artery, or capillary.

Vascular Function: Refers to the efficiency and health of blood vessels regarding circulation, including their ability to constrict or dilate to regulate blood pressure