Human heart. Artwork of a healthy human heart. The main blood vessels of the heart are visible at upper centre. At left is the vena cava (mauve) where blood arrives from the body. Blood is pumped through that side of the heart to the lungs and back to the heart through the pulmonary system of blood vessels (mauve, upper centre). Oxygenated blood is then pumped to the rest of the body through the main artery, the aorta (red, upper centre). The heart muscle itself is supplied with fresh blood through coronary arteries (not seen) on the surface of the heart.
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