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Endothelial cells, which form the tunica intima, encircle an erythrocyte (E).
Code TH H2.

Endothelium is a layer of cells that line the walls of the circulatory system which carries blood around the body.[1] The cells form a membrane so that certain substances, such as nutrients, can move through the walls. In an adult human there is about 1 kg of endothelium, which would cover an area of about 7 m2.[1] The endothelium plays an important part in controlling the flow of blood around the body.