Human heart. Artwork of a silhouette of a man with a healthy heart. The main blood vessels of the heart are seen. The heart's four internal chambers are also visible. Deoxygenated blood (blue) from the body reaches the heart and is pumped to the lungs, and then back to the heart through pulmonary blood vessels. Oxygenated blood (yellow) is then pumped from the heart to the rest of the body. The heart muscle itself is supplied with blood from coronary arteries (not seen) on the surface of the heart.
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