Monday, April 16, 2012

Structure of hair




Hair grows from a follicle that's located below the surface of the skin. The hair shaft, that is that the solely half we have a tendency to see, consists mainly of keratin and is entirely dead. 

Each hair features a spong inner core, the medulla, that is surrounded by a stronger layer known as the cortex. The cortex is reponsible for the strength, thickness, and suppleness of the hair. It conjointly contains melanin, the pigment that verify hair color. Any product designed to give birth to permanent modification, like bleaches, tints and perms, should penetrate the cortex to restructure a hair's characterstics. The cortex is protected by the cuticle, that could be a clear layer of small, overlapping scales of keratin. When the hair is in sensible condition the keratin scales are going to be shiny and lie flat; if your hair is tangled, dry or broken the scales are going to be ruffled, which can offer your hair a boring look and a rough texture.

 
Hair Growth

The hair root is that the fastest growing organ within the body; hair on the scalp grows at the speed of regarding one in. a month. Hair doesn't grow at a relentless rate. It grows faster in summer than in winter, and grows at totally different rates over the pinnacle. the expansion rate for every person varies. The cycle, that is that the time between the primary growth of hair and its final shedding, typically lasts for between 3 to 5 years, however might proceed for much longer. When the cycle is over, the follicle shrinks and goes into a resting section that lasts for some months. The previous hair stops obtaining longer and easily remains within the follicle till a brand new hair forms beneath and pushes it out.

The common person sheds regarding a hundred hairs day after day. Fortunately, the expansion and resting cycles aren't synchronized in adjacent follicles and you are doing not notice any obvious patches of hair loss. Some individuals notice it troublesome to grow their hair long, whereas others notice it terribly straightforward. this can be the results of your explicit combination of growth rate and hair era - on condition that your hair features a quick growth rate and a protracted era are you able to quickly and successfully grow your hair long.

There are between a hundred,000 and one hundred fifty,000 hairs growing on the pinnacle at anybody time. Redheads have quantity} amount of strands however the thickest hair, whereas blondes have the foremost quantity however the best hair. This total range decreases as you grow old, as some follicles wear out and aren't replaced. the speed at that you lose hair is genetically determined an can't be halted.

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