and intestines. The aorta later divides into the left andright common iliacs, which supply the lowerextremities (fig. 1-35).ARTERIES OF THE LOWER EXTREM-ITIES.—The left and right common iliacs, uponentering the thigh, become the femoral artery. At theknee, this same vessel is named the popliteal artery(fig. 1-35).Venous SystemVenous circulation is responsible for returning theblood to the heart after exchanges of gases, nutrients,and wastes have occurred between the blood and bodycells (fig. 1-36). To return this blood to the heart forreoxygenation, the venous system begins with themerging of capillaries into venules, venules into smallveins, and small veins into larger veins. The bloodvessel paths of the venous system are difficult to1-29HM3F0135CLEFTCOMMONCAROTIDLEFTSUBCLAVIANPULMONARYAXILLARYBRACHIALLEFTCORONARYRADIALULNARINTERNALCAROTIDEXTERNALCAROTIDRIGHTCOMMONCAROTIDRIGHTSUBCLAVIANINNOMINATEARCH OFAORTARIGHTCORONARYAORTACOMMONILIACEXTERNALILIACFEMORALPOPLITEALFigure 1-35.—Principal vessels of the arterial system.
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