MadSci Network: Medicine |
This question, and many more like it, has been answered in the "Last Word" section of the New Scientist, which can be found at New Scientist. --------------------------------------------------------------- Joe Miletich Washington University School of Medicine q. Why does skin--especially of the fingers and toes--become wrinkled after prolonged immersion in water? LLOYD UNVERFERTH Wahroonga New South Wales _______________________________________________________ a. The tips of fingers and toes are covered by a tough, thick layer of skin which, when soaked for a prolonged period, absorbs water and expands. However, there is no room for this expansion on fingers and toes, so the skin buckles. STEVEN FRITH Rushden Northamptonshire a. Your whole body does not become crinkled as the skin has a layer of waterproof keratin on the surface, preventing both water loss and uptake. On the hands and feet, especially at the toes and fingers, this layer of keratin is continually worn away by friction. Water can then penetrate these cells by osmosis and cause them to become turgid. ROBERT HARRISON Leeds
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