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2. Hair - Wikipedia

   en.wikipedia.org/wiki/Hair

   Hair provides thermal regulation and camouflage for many animals; for others it provides signals to other animals such as warnings, mating, or other communicative displays; and for some animals hair provides defensive functions and, rarely, even offensive protection. Hair also has a sensory function, extending the sense of touch beyond the ...

3. Hair follicle - Wikipedia

   en.wikipedia.org/wiki/Hair_follicle

   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. [1]

4. Hair cell - Wikipedia

   en.wikipedia.org/wiki/Hair_cell

   The molecular biology of hair cells has seen considerable progress in recent years, with the identification of the motor protein that underlies somatic electromotility in the outer hair cells. Prestin's function has been shown to be dependent on chloride channel signaling and that it is compromised by the common marine pesticide tributyltin.

5. Body hair - Wikipedia

   en.wikipedia.org/wiki/Body_hair

   Determining the evolutionary function of androgenic hair must take into account both human evolution and the thermal properties of hair itself. The thermodynamic properties of hair are based on the properties of the keratin strands and amino acids that combine into a 'coiled' structure. This structure lends to many of the properties of hair ...

6. Human hair growth - Wikipedia

   en.wikipedia.org/wiki/Human_hair_growth

   Hair is a stratified squamous keratinized epithelium made of multi-layered flat cells whose rope-like filaments provide structure and strength to the hair shaft. The protein called keratin makes up hair and stimulates hair growth. Hair follows a specific growth cycle with three distinct and concurrent phases: anagen, catagen, and telogen. Each ...

7. Arrector pili muscle - Wikipedia

   en.wikipedia.org/wiki/Arrector_pili_muscle

   The arrector pili muscles, also known as hair erector muscles, [1] are small muscles attached to hair follicles in mammals. Contraction of these muscles causes the hairs to stand on end, [ 2 ] known colloquially as goose bumps (piloerection).