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Hair is a protein filament that grows from follicles found in the dermis.Hair is one of the defining characteristics of mammals.The human body, apart from areas of glabrous skin, is covered in follicles which produce thick terminal and fine vellus hair.
The body has different types of hair, including vellus hair and androgenic hair, each with its own type of cellular construction. This varied construction gives the hair unique characteristics, serving specific purposes, mainly warmth (redundant in modern humans) and physical protection. [ 2 ]
There are many human diseases in which abnormalities in hair appearance, texture or growth are early signs of local disease of the hair follicle or systemic illness. Well known diseases of the hair follicle include alopecia [2] or hair loss, hirsutism or excess hair growth and lupus erythematosus. [3] [2]
A strand of human hair has its own life cycle with four phases: anagen (the growth phase), which lasts several years; the transitional “catagen” period, which lasts a few weeks; telogen (the ...
While the role of estrogen, the primary female hormone, in human hair growth isn’t totally clear, it may play a protective role against hair loss in women. Estradiol, a form of estrogen, plays a ...
The human body is the entire structure of a human being. It is composed of many different types of cells that together create tissues and subsequently organs and then organ systems . The external human body consists of a head , hair , neck , torso (which includes the thorax and abdomen ), genitals , arms , hands , legs , and feet .