I really don't know why
2006-10-27 23:46:23 · 4 answers · asked by cornelia 1 in Science & Mathematics ➔ Biology
In evolutionary terms, hair was probably first used as specialised sensory strucures (think a cat's whiskers) however over evolutionary terms they became used for warmth. In humans they are a thermo-regulatory device. That means that when we get cold they stand up and trap heat close to our skin. We have a lot of hair on our heads because that is where most of the heat loss occurs
2006-10-28 00:09:19 · answer #1 · answered by Anonymous · 0⤊ 0⤋
And hair cells and hair actually contribute to maintaining a constant internal body temperature. When the body is too cold, the hairs stand up and trap air to add warmth. When the body is too warm, they lay flat.
2006-10-28 06:53:31 · answer #2 · answered by jonn0boy 3 · 1⤊ 0⤋
It works like a valve on the skin pores..
2006-10-28 06:59:13 · answer #3 · answered by Drone 7 · 0⤊ 0⤋
bcauz we r from apes!!!!!!!dont forget that!!!!
2006-10-28 06:51:01 · answer #4 · answered by chochang_special45571 1 · 0⤊ 0⤋