It is not entirely known. However, the most recent data suggests that it is part of a thermoregulatory response that helps cool the brain by shunting blood to facial muscles that act as radiators and offload heat from the redirected blood.
Tuesday, June 28, 2011
Why do people yawn?
It is not entirely known. However, the most recent data suggests that it is part of a thermoregulatory response that helps cool the brain by shunting blood to facial muscles that act as radiators and offload heat from the redirected blood.
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