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Circulatory system
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====Systemic circulation==== [[File:2105 Capillary Bed.jpg|thumb|upright=1.4|Capillary bed]] [[File:Capillary system CERT.jpg|thumb|Diagram of capillary network joining the arterial system with the venous system]] The systemic circulation is a circuit loop that delivers oxygenated blood from the left heart to the rest of the body through the [[aorta]]. Deoxygenated blood is returned in the systemic circulation to the right heart via two large veins, the [[inferior vena cava]] and [[superior vena cava]], where it is pumped from the right atrium into the pulmonary circulation for oxygenation. The systemic circulation can also be defined as having two parts β a macrocirculation and a [[microcirculation]].<ref name="Guyton"/>
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