Endothelium
Composed of just a single layer of cells, the endothelium acts as a semipermeable barrier between the vessel lumen (i.e., the street, where the blood flows) and the arterial wall proper - Outlive
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Composed of just a single layer of cells, the endothelium acts as a semipermeable barrier between the vessel lumen (i.e., the street, where the blood flows) and the arterial wall proper - Outlive