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  2. Hair - Wikipedia

    en.wikipedia.org/wiki/Hair

    The only "living" portion of the hair is found in the follicle. The hair that is visible is the hair shaft, which exhibits no biochemical activity and is considered "dead". The base of a hair's root (the "bulb") contains the cells that produce the hair shaft. [12]

  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

  4. Hyperkeratinization - Wikipedia

    en.wikipedia.org/wiki/Hyperkeratinization

    The dead cells are then forced out of the follicle (primarily by the growing hair). However, in hyperkeratinization, this process is interrupted and a number of these dead skin cells do not leave the follicle because of an excess of keratin, a natural protein found in the skin. This excess of keratin, which is influenced by genetics, results in ...

  5. 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 ...

  6. Cuticle (hair) - Wikipedia

    en.wikipedia.org/wiki/Cuticle_(hair)

    The hair cuticle is the outermost part of the hair shaft. [1] It is formed from dead cells, overlapping in layers, which form scales that strengthen and protect the hair shaft. [2] [3] These layers are formed of keratin proteins. [4] The hair cuticle is also known to contain anteiso-18-methyleicosanoic acid which contribute to the hydrophobic ...

  7. Cell death - Wikipedia

    en.wikipedia.org/wiki/Cell_death

    Overview of signal transduction pathways involved in apoptosis. Cell death is the event of a biological cell ceasing to carry out its functions. This may be the result of the natural process of old cells dying and being replaced by new ones, as in programmed cell death, or may result from factors such as diseases, localized injury, or the death of the organism of which the cells are part.

  8. Body hair - Wikipedia

    en.wikipedia.org/wiki/Body_hair

    Growth of androgenic hair is related to the level of androgens (male hormones) and the density of androgen receptors in the dermal papillae. Both must reach a threshold for the proliferation of hair follicle cells. From childhood onward, regardless of sex, vellus hair covers almost the entire area of the human body.

  9. Hair cell - Wikipedia

    en.wikipedia.org/wiki/Hair_cell

    In mammalian outer hair cells, the varying receptor potential is converted to active vibrations of the cell body. This mechanical response to electrical signals is termed somatic electromotility; [13] it drives variations in the cell's length, synchronized to the incoming sound signal, and provides mechanical amplification by feedback to the traveling wave.