GUSTOIMAGES / SCIENCE PHOTO LIBRARY GUSTOIMAGES / SCIENCE PHOTO LIBRARY
Heart and lungs. Coloured X-ray of a man's healthy chest, showing the lungs (dark, down centre left and right) and heart. The heart is seen as the bulge into the dark lung area at lower right. The diaphragm is the convex line running from bottom left to bottom right. It is a sheet of muscle which controls the volume of the lung cavity (and thus breathing) by regular contraction and relaxation. The lungs and heart are surrounded by the ribs (horizontal lines). The backbone, composed of many vertebrae (rectangular blocks), runs down centre.
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