Final answer:
Oxygenated blood leaves the heart through the Aorta.
Step-by-step explanation:
Oxygenated blood leaves the heart and enters the blood vessels of the human body by way of the Aorta. The Aorta is the main artery that carries oxygen-rich blood from the left ventricle of the heart to the rest of the body. It branches out into smaller arteries that supply oxygenated blood to different organs and tissues.
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