ALFRED PASIEKA / SCIENCE PHOTO LIBRARY ALFRED PASIEKA / SCIENCE PHOTO LIBRARY
Normal chest X-ray showing a man's healthy lungs and heart. The lungs (dark areas to the left and right of the central spinal column) are enclosed by the ribs (pale bands). The heart is the light area to the lower right of spinal column. At upper right and upper left are the clavicles (collar bones, horizontal). Below each clavicle is a humerus (upper arm bone).
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