FRANCIS LEROY & GEORGES LAMBERT, BIOCOSMOS / SCIENCE PHOTO LIBRARY FRANCIS LEROY & GEORGES LAMBERT, BIOCOSMOS / SCIENCE PHOTO LIBRARY
Red blood cell in hypertonic solution. This hypertonic solution has more urea molecules (blue and black) than the inside of the red blood cell (shown by circular outline). This means water diffuses across the cell's semi-permeable membrane out of the cell. The red blood cell shrinks and loses its distinctive concave shape. It can no longer function as a red blood cell.
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