The Endothelium

The endothelium is a thin layer of cells lining the inside of blood vessels, including arteries, veins, and capillaries. It acts as a vital barrier and regulator, controlling what passes between the bloodstream and surrounding tissues. The endothelium helps regulate blood flow, prevent blood clots, and maintain vessel flexibility. It also releases substances that influence immune responses and blood pressure. Overall, it plays a crucial role in keeping blood vessels healthy and functioning properly, which is essential for overall cardiovascular health.