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The Learning Kingdom's Cool Fact of the Day for August 16, 1999
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Why do people sometimes get "goose bumps?"
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When you are cold, frightened, or angry, you might notice a peculiar
prickly sensation on your arms and legs, and maybe on the back of your
neck. You've got goose bumps, also known as piloerection.
Piloerection is the tightening of tiny muscles at the bases of hairs.
When it happens, the skin puckers into thousands of tiny peaks, one
for each hair. Each hair stands straight out from the skin, and the
skin itself becomes tighter.
When you get goose bumps, your body is trying to stay warm by
"fluffing out" your fur. This is a trait that we carry from our
ancient ancestors who, millions of years ago, had a lot more hair
than we do. Since we no longer have fur, it is not thought to serve
any useful function today.
More about goose bumps:
http://www.fhradio.org/fm/archives/1995/1830(FM).html
http://www.eecs.umich.edu/mathscience/funexperiments/agesubject/
lessons/beakman/gbump.html
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