Hair Science | Hair Scalp

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Notice that even if humans shave their scalp, there are no life-threatening effects that would result from the none-existence of hair in one’s body. Scalp and body hair is not really essential in human’s physical health. However, hair is a big help to protect humans or all kinds of mammals for that matter, from excessive cold or heat.

The hair on the scalp grows at 6 inches length annually. That is 0.3 to 0.4 mm everyday. There are no definite season or cycle in the shedding of human hair. One may experience hair loss any moment. At the same time, random number of hair strands may undergo any of the three stages of hair shedding and hair growth. These stages are anagen, catagen and telogen. During the anagen phase, 1 centimeter is added to the existing hair length every 28 days and the scalp remains in this active growth stage for at least two years till six years. The catagen phase, the next stage after anagen, is the end of the growth of the active hair. Catagen stage is the phase where the body produces new hair and usually lasts from two to three weeks. The last stage is the telogen, wherein eight percent of the hair is usually at rest. When a hair undergoing telogen phase has been pulled out from the scalp, it will reveal a dry, white, hard material at the root and typically lasts for about 100 days for the hairs located at the scalp.

Everybody is experiencing these three stages of hair growth. However, due to several aspects, from environment to genetics, the result is varied, causing alopecia or baldness for some. And since there are different causes, there are also different types of hair loss and treatments.

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