ALFRED PASIEKA / SCIENCE PHOTO LIBRARY ALFRED PASIEKA / SCIENCE PHOTO LIBRARY
Heart and red blood cells, computer artwork. The heart is a hollow muscle that pumps blood around the body. Deoxygenated blood from the body is carried into the right side of the heart (left). From here, the blood travels into the lungs, where it is oxygenated. The blood is then carried into the left side of the heart (right), which pumps it around the rest of the body. Red blood cells (erythrocytes) contain haemoglobin, a red iron-containing pigment that has an oxygen-carrying capacity. The cells' main function is to deliver oxygen to, and remove waste carbon dioxide from, the tissues of the body.
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