MANFRED KAGE / SCIENCE PHOTO LIBRARY MANFRED KAGE / SCIENCE PHOTO LIBRARY
Endoscope image revealing the appearance of the interior (lumen) of human arteries. Two main channels are visible; the artery at right is seen to divide (bifurcate) into two. The entire network of blood vessels (arteries & veins) is lined internally by a single layer of endothelial cells, arranged longitudinally to the axis of the vessel. The endothelium is thin & delicate; defects in the lining are associated with a number of disease conditions.
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