Thread: Baldness
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Old October 20th, 2010, 11:21 AM
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Pratiksha Pratiksha is offline
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Re: Baldness

Quote:
Originally Posted by Rakhi View Post
Does our heads "need" to remain warm? I thought if you dont want to, you dont need to wear a winter-cap.
Quote:
While humans have developed clothing and other means of keeping warm, the hair found on the head serve as primary sources of heat insulation; elsewhere their function is debated. Hats and coats are still required while doing outdoor activities in cold weather to prevent frost bite and hypothermia, but the hair on the human body does help to keep the internal temperature regulated. When the body is too cold, the erector pili muscles found attached to hair follicles stand up, causing the hair in these follicles to do the same. These hairs thus form a heat-trapping layer above the epidermis. This is called piloerection, which is a Latin word where 'Pilo' means hair and 'erect' means to stiffen. This process is more commonly known as having goose bumps.[10] The opposite happens when the body is too warm. The erector muscles make the hair lay flat on the skin which allows heat to leave.

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