Editing Circulatory system (section)

====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 – a macrocirculation and a [[microcirculation]].<ref name="Guyton"/>