CNRI / SCIENCE PHOTO LIBRARY CNRI / SCIENCE PHOTO LIBRARY
Lungs. X-ray of a woman's chest showing healthy lungs enclosed by her ribs. The heart is an opaque bulge just right of lower centre on the subject's left side in this frontal view. The transparency of healthy lungs to X-rays means that they appear black. The collar bones (clavicles) are seen at top, meeting over the spine (running down centre).
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