Get a grip
The article “Pruney fingers get better grip” (SN: 2/9/13, p. 11) indicated that skin wrinkling in response to extended exposure to water was the result of constricting blood vessels. I was waiting to read about the possibility that this was the body’s response to prevent heat loss. Water has a high heat capacity, and therefore I might expect that blood vessel constriction is to minimize heat transfer from the body to the water. Perhaps the wrinkling is a secondary, albeit advantageous, effect.
Jim Marrone, Pinole, Calif.
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