Which heart chamber pumps oxygenated blood to the systemic circulation?

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The left ventricle is responsible for pushing oxygenated blood into the systemic circulation. After blood is oxygenated in the lungs, it returns to the heart into the left atrium, moves into the left ventricle, and then is ejected through the aorta to supply the body. The left ventricle has the thickest muscular wall because it must generate enough high pressure to overcome the resistance of the entire systemic circulation. The other chambers have different roles: the right atrium gathers deoxygenated blood from the body, the right ventricle pumps blood to the lungs for oxygenation, and the left atrium receives oxygenated blood from the lungs but does not propel it into systemic circulation.