Is there a reason why hair grows in the human body?

Question

(is it phosphorous excretion mechanism)? If so, why cant I use my hair like a match to strike a fire? Why do all human beings do not grow same length hair in the same body regions? Some have short hair some have long hair distributed in different areas of human body? Is it there to create air traction (landing points) for "nothing but air"?

Answer 1

all mammals have fur growth in almost all parts of their body. humans being mammals have hair and the only place where hair does not grow is the lips and the top of eye lids. hair growth is not a mechanism for any excretion. but the base of the hair(where the hair follicle is present) has sebaceous gland which produce sebum or oil like substance. all humans do not have similar hair growth. it depends on body fat and the hormonal levels in their body and their ethnicity. and about varying lenghts of hair in different lengths, evolution has caused the growth of hair to be different. if u consider the case of animals, it s almost same everywhere. humans hav learnt to wear clothes and hence able to warm himself in a different manner and hence body hair has become a redundant factor.

Answer 2

Not sure about armpit. Genitals, you need a lot of protection. From an evolutionary standpoint, if you're getting a lot of infections, your gonads are going to end up destroyed. It's the same reason you have hair in your nose; to filter out germs, dirt, and foreign objects. And we have hair elsewhere, but we haven't had an ice age in millions of years so it's thinned to unnoticeability, in most cases. That's why you get goosebumps when you're cold or scared. Your body is raising hairs that no longer help to insulate or make you look larger/more threatening.

Answer 3

It's just leftover fur. It was originally there for warmth. We still have hair on our heads for padding, because there's not much fat up there to protect our skulls. Body hair used to be used for transmitting scents, back when sweat was considered attractive.