anatomical 3d of red blood cells in blood circulation.

anatomical illustration red blood cells circulation transparent capillary glass blue background arteries arterioles capillaries venules veins vessel hollow structure tubular circulatory system leads driven action heart function transport nutrients oxygen substances waste carbon dioxide contract vasoconstriction dilate vasodilation pressure flow ramifications metarteriole tunica intima media vasculitis arteriosclerosis erythrocyte anemia cardiovascular white circulation background