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Arteriole section showing the tunica media of numerous circularly arranged elastic fibers that permit these vessels to expand during systole and to recoil passively during diastole.  The arteriole lumen is lined by a continuous layer of endothelial cells whose internal nuclei cause the cells to bulge into the lumen.  SEM X2200.  3.5" X 4.5"  **On Page Credit Required**.