![]() The left ventricle is the main pumping chamber of the left heart, then pumps, sending freshly oxygenated blood to the systemic circulation through the aortic valve. Oxygenated blood thus fills the left ventricle, passing through the mitral valve. All four of these veins open into the left atrium that acts as a collection chamber for oxygenated blood. As with the right atrium, the left atrium passes the blood onto its ventricle both by passive flow and active pumping. This oxygenated blood is collected by the four pulmonary veins, two from each lung. In the lungs, the blood oxygenates as it passes through the capillaries, where it is close enough to the oxygen in the alveoli of the lungs. ![]() The right ventricle pumps blood through the right ventricular outflow tract, across the pulmonic valve, and into the pulmonary artery that distributes it to the lungs for oxygenation. From here, blood flows through the tricuspid valve to fill the right ventricle, which is the main pumping chamber of the right heart. ![]() The right atrium, therefore, acts as a reservoir to collect deoxygenated blood. Also, deoxygenated blood from the heart muscle itself drains into the right atrium via the coronary sinus. The right atrium receives deoxygenated blood from the entire body except for the lungs (the systemic circulation) via the superior and inferior vena cavae. The heart consists of four chambers organized into two pumps (right and left) to provide blood flow to the systemic and pulmonary circulations.
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