Which heart chamber sends oxygenated blood to the systemic circulation?

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The left ventricle is the chamber that sends oxygenated blood to the systemic circulation. After receiving oxygen-rich blood from the lungs via the left atrium, the left ventricle contracts and pushes blood into the aorta, distributing it through the body at high pressure. This high pressure is necessary to overcome the resistance of the systemic vessels and ensure tissues receive enough oxygen. The right ventricle, by contrast, pumps blood to the lungs for oxygenation, and the atria are receiving chambers: the left atrium collects oxygenated blood from the lungs, while the right atrium collects deoxygenated blood from the body.