Blood supply. Artwork illustrating the supply of blood to the body's organs. The heart (upper centre, red) is responsible for pumping the blood around the body. It goes to the lungs (upper centre, blue) for oxygenation. The left lung is cut away, showing the network of blood vessels inside it. From the lungs, blood returns to the heart and is distributed around the body. Blood is pumped to up to the brain (top centre, blue), and down to the other organs. These are the liver (centre, red), the kidneys (centre, brown) and the intestines (centre, green). Also, the blood takes oxygen to the muscles in the arms and legs.
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