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This measurement is not precise because human hair varies in diameter, ranging anywhere from 17 μm to 181 μm [millionths of a metre] [8] One nominal value often chosen is 75 micrometres (0.0030 in), [5] but this – like other measures based upon such highly variable natural objects, including the barleycorn [9] – is subject to a fair degree of imprecision.
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.
Scalp hair was reported to grow between 0.6 cm and 3.36 cm per month. The growth rate of scalp hair somewhat depends on age (hair tends to grow more slowly with age), sex, and ethnicity. [3] Thicker hair (>60 μm) grows generally faster (11.4 mm per month) than thinner (20–30 μm) hair (7.6 mm per month). [4]
The hair follicle is an organ found in mammalian skin. [1] It resides in the dermal layer of the skin and is made up of 20 different cell types, each with distinct functions.. The hair follicle regulates hair growth via a complex interaction between hormones, neuropeptides, and immune cells
Hair analysis (alternative medicine) Hair casts; Hair cloning; Hair disease; Hair fetishism; Hair follicle nevus; Hair hang; Hair loss; Hair oil; Hair removal; Hair tattoo; Hair theft; Hair washing without commercial shampoo; Hair whorl; Hair's breadth; Hairwork; Head shaving; Human hair growth; Hypertrichosis; Hypotrichosis
Human hair ranges in color from red to blond to brown to black, which is the most frequent. [247] ... Human groups range from the size of families to nations.
Arm hair. Arm hair grows on a human's forearms, sometimes even on the elbow area, and rarely on a human's bicep, triceps, and/or shoulders. Terminal arm hair is concentrated on the wrist end of the forearm, extending over the hand. Terminal hair growth in adolescent males is often much more intense than that in females, particularly for ...
Size also varies between the sexes, with the sexual dimorphism in humans being more pronounced than that of chimpanzees, but less than the dimorphism found in gorillas. [3] The colouration of skin, hair and eyes also varies considerably, with darker pigmentation dominating in tropical climates and lighter in polar regions.
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