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When blood enters the heart, it first goes into the right atrium. The right atrium then contracts, pushing the blood into the right ventricle. The right ventricle then contracts, pumping the deoxygenated blood into the pulmonary artery, which takes it to the lungs for oxygenation.
After the blood is oxygenated in the lungs, it returns to the heart via the pulmonary veins. The oxygenated blood enters the left atrium. The left atrium then contracts, pushing the blood into the left ventricle. Finally, the left ventricle contracts, pumping the oxygenated blood into the aorta, the largest artery in the body.
Hence, option 4 - Left ventricle, is the correct answer. The left ventricle is responsible for pumping the oxygenated blood from the heart into the aorta, which distributes it to the rest of the body`s organs and tissues.