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Blood flows from the right atrium into the right ventricle, where it is then pumped into the pulmonary circuit. The blood in the branches of the pulmonary artery is low in oxygen and relatively high in carbon dioxide. Gas exchange occurs in the pulmonary capillaries, where oxygen enters the blood and carbon dioxide is released. Blood that is now rich in oxygen and low in carbon dioxide returns to the left atrium. From the left atrium, blood moves into the left ventricle, which pumps it into the systemic circuit. In the systemic capillaries, oxygen and nutrients are delivered from the blood to tissues, while carbon dioxide and waste products are absorbed into the blood. This oxygen-poor blood then returns to the right atrium, and the cycle repeats. *LICENSES AND ATTRIBUTIONS CC licensed content, Shared previously, Heart Anatomy, Authored by: OpenStax College. License: CC BY: Attribution. License Terms: Download for free at:http://cnx.org/contents/Y5T_wVSC@3/Heart-Anatomy*
