MEHAU KULYK / SCIENCE PHOTO LIBRARY MEHAU KULYK / SCIENCE PHOTO LIBRARY
Heart and red blood cells. Computer artwork of a heart surrounded by red blood cells. 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. From here, the blood travels into the lungs, where it is oxygenated. The blood is then carried into the left side of the heart before travelling back to the body, where it can exchange oxygen for carbon dioxide and start the cycle all over again.
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