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ShareHair is a filamentous outgrowth of the skin found only in mammals.
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The speed of hair growth is roughly 11 cm/yr.
The average human head has about 100,000 hair follicles.
Older people tend to develop grey hair because the pigment in the hair is lost and the hair becomes colourless.
Grey hair is considered to be a characteristic of normal aging.
The age at which this occurs varies from person to person, but in general nearly everyone 75 years or older has grey hair, and in general men tend to become grey at younger ages than women.
For more information about the topic Hair, read the full article at Wikipedia.org, or see the following related articles:
Hair follicle — A hair follicle is part of the skin that grows hair by packing old cells together. Attached to the follicle is a sebaceous gland, a tiny ... > read more
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Keratin — Keratins are a family of fibrous structural proteins; tough and insoluble, they form the hard but nonmineralized structures found in reptiles, birds ... > read more
Crab louse — Crab lice (singular, louse), scientific name Phthirus pubis and commonly called "crabs" due to their resemblance to the crab, are one of three kinds ... > read more
Skin — In zootomy and dermatology, skin is an organ of the integumentary system composed of a layer of tissues that protect underlying muscles and organs. ... > read more
Louse — Lice (singular: louse) (order Phthiraptera) are an order of over 3,000 species of wingless parasitic insects. Lice attach their eggs to their host's ... > read more
Auditory system — The auditory system is the sensory system for the sense of hearing. The sound waves enter the ear canal, a simple tube (but one which amplifies ... > read moreEditor's Note: This article is not intended to provide medical advice, diagnosis or treatment.
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