SCOTT CAMAZINE, SUE TRAINOR / SCIENCE PHOTO LIBRARY SCOTT CAMAZINE, SUE TRAINOR / SCIENCE PHOTO LIBRARY
Heart. Coloured X-ray of the chest of a healthy person showing the position of the heart (red). The heart is a hollow, muscular organ that pumps blood around the body. Also seen here are the lungs (dark areas) and the bones of the ribcage (yellow, horizontal lines), which encircle the heart and lungs.
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