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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 ilustración anatómica vaso capilar trasparente fondo orgánico mostrando glóbulos rojos circulación sangre ánico organic showing moving horizontally stream