The heart circulates blood throughout the body, delivering nutrition and oxygen to every cell while also eliminating waste. In the systemic circulation, the left heart pumps oxygenated blood back from the lungs to the rest of the body. In the pulmonary circulation, the right heart sends deoxygenated blood to the lungs. Each circulation in the human heart has one atrium and one ventricle, while the systemic and pulmonary circulations each have four chambers: left atrium, left ventricle, right atrium, and right ventricle. The upper chamber of the right side of the heart is known as the right atrium.

The blood that returns to the right atrium is deoxygenated (low in oxygen) and pumped into the right ventricle, where it is re-oxygenated and carbon dioxide removed before being pumped into the lungs via the pulmonary artery. The left atrium receives newly oxygenated blood from the lungs as well as the pulmonary vein, which is then pushed through the aorta to the various organs of the body by the strong left ventricle.


Circulation of the lungs

The pulmonary circulation is the part of the circulatory system where oxygen-depleted blood is transported from the heart to the lungs via the pulmonary artery and then returns to the heart, oxygenated, via the pulmonary vein. The superior and inferior vena cava’s oxygen-depleted blood enters the right atrium of the heart and travels through the tricuspid valve (right atrioventricular valve) into the right ventricle, where it is pushed to the lungs via the pulmonary semilunar valve. CO2 is released from the blood and oxygen is absorbed in the lungs during gas exchange. The increasingly oxygen-rich blood is returned to the left atrium via the pulmonary vein.

The bronchial circulation is a distinct system that provides blood to the tissue of the lung’s major airways.

Circulation throughout the body

The section of the circulatory system that takes oxygenated blood away from the heart through the aorta from the left ventricle, where the blood had previously been deposited from pulmonary circulation, to the rest of the body, and returns oxygen-depleted blood to the heart, is known as systemic circulation.

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