Stubble typically appears to grow back thicker because the shaved hairs are blunted instead of tapered off at the end, although the hair never actually grows back thicker. Protection In some mammals, such as hedgehogs and porcupines , the hairs have been modified into hard spines or quills. Dark skin probably evolved after humans lost their body fur, because the naked skin was vulnerable to the strong UV radiation as explained in the Out of Africa hypothesis. Evolution Hair has its origins in the common ancestor of mammals, the synapsids , about million years ago. Hair care Hair care involves the hygiene and cosmetology of hair including hair on the scalp , facial, pubic and other body hair. Adults are found only on the human host and require human blood to survive. Removal practices Depilation is the removal of hair from the surface of the skin. C Coarse Thick strands whose shed strands usually are easily identified against most backgrounds; similar to hair found on many people of Asian or Native American descent. Society and culture[ edit ] This section needs additional citations for verification.
The eyelash is to humans, camels, horses, ostriches etc. While primate species have communal sleeping arrangements, these groups are always on the move and thus are less likely to harbor ectoparasites. Multiple religions, both ancient and contemporary, require or advise one to allow their hair to become dreadlocks , though people also wear them for fashion. The female-male size differential among other closely associated primates is much greater than among humans, and therefore it was reduced during human evolution. Volume by circumference of full-hair ponytail i circumference less than 2 inches 5 centimetres ii Pubic hair removal using wax is bikini waxing. November Learn how and when to remove this template message The general hairlessness of humans in comparison to related species may be due to loss of functionality in the pseudogene KRTHAP1 which helps produce keratin in the human lineage about , years ago. This is especially evident in men who develop a five o'clock shadow after having shaved their faces. Sometime during the gradual process by which Homo erectus began a transition from furry skin to the naked skin expressed by Homo sapiens, hair texture putatively gradually changed from straight hair[ citation needed ] the condition of most mammals, including humanity's closest cousins—chimpanzees to Afro-textured hair or 'kinky' i. August Learn how and when to remove this template message Jablonski  asserts head hair was evolutionarily advantageous for pre-humans to retain because it protected the scalp as they walked upright in the intense African equatorial UV light. Natural, Au naturel Hair removed generally waxed from the sides to form a triangle so that pubic hair cannot be seen while wearing swimwear. In most people, it is darker, although it can also be lighter. Hair is most noticeable on most people in a small number of areas, which are also the ones that are most commonly trimmed, plucked , or shaved. Regional variations in hirsutism cause practices regarding hair on the arms and legs to differ. It is not known whether the increased distribution of sweat glands occurred before, during, or after, the change in body hair, or even whether the two are related developments. In this sense the possibility that hair texture may have played an adaptively significant role cannot be completely eliminated from consideration. Disease Ringworm is a fungal disease that targets hairy skin. A full pelage likely did not evolve until the therapsid-mammal transition. This suggests that humans had lost body hair but retained head hair and developed thick pubic hair prior to this date, were living in or close to the forest where gorillas lived, and acquired pubic lice from butchering gorillas or sleeping in their nests. Protection In some mammals, such as hedgehogs and porcupines , the hairs have been modified into hard spines or quills. Pubic lice typically are found attached to hair in the pubic area but sometimes are found on coarse hair elsewhere on the body for example, eyebrows , eyelashes , beard , mustache , chest , armpits , etc. In fact, although genetic findings Tishkoff, suggest that sub-Saharan Africans are the most genetically diverse continental group on Earth, Afro-textured hair approaches ubiquity in this region. The eyebrows provide moderate protection to the eyes from dirt , sweat and rain. Thick hair such as that of the lion's mane and grizzly bear's fur do offer some protection from physical damages such as bites and scratches. Hair care routines differ according to an individual's culture and the physical characteristics of one's hair. Some people remove pubic hairs for erotic and sexual reasons or because they or their sex partner enjoy the feel of a hairless crotch. Laser removal is practiced in many clinics along with many at-home products.
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