Any of the tubular vessels conveying the blood (arteries, arterioles, capillaries, venules, and veins).
Blood Vessel,Vessel, Blood,Vessels, Blood
D004727
Endothelium
A layer of epithelium that lines the heart, blood vessels (ENDOTHELIUM, VASCULAR), lymph vessels (ENDOTHELIUM, LYMPHATIC), and the serous cavities of the body.