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  2. Human hair growth - Wikipedia

    en.wikipedia.org/wiki/Human_hair_growth

    It is commonly stated that hair grows about 1 cm per month on average; however reality is more complex, since not all hair grows at once. 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 ...

  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. Ground tissue - Wikipedia

    en.wikipedia.org/wiki/Ground_tissue

    This tissue system is present between the dermal tissue and forms the main bulk of the plant body. Parenchyma cells have thin primary walls and usually remain alive after they become mature. Parenchyma forms the "filler" tissue in the soft parts of plants, and is usually present in cortex, pericycle, pith, and medullary rays in primary stem and ...

  5. Guard cell - Wikipedia

    en.wikipedia.org/wiki/Guard_cell

    SV channels have been shown to function as cation channels that are permeable to Ca 2+ ions, [35] but their exact functions are not yet known in plants. [39] Guard cells control gas exchange and ion exchange through opening and closing. K+ is one ion that flows both into and out of the cell, causing a positive charge to develop.

  6. Guess What? Finding Hair In Food Isn't That Bad For You - AOL

    www.aol.com/lifestyle/food-guess-what-finding...

    In fact, a protein found in human hair called L-cysteine is sometimes used as an additive to certain foods. L-cysteine is an amino acid found in keratin, which some food manufacturers use to ...

  7. Body hair - Wikipedia

    en.wikipedia.org/wiki/Body_hair

    The average ages pubic hair begins to grow in males and females are 12 and 11, respectively. However, in some females, pubic hair has been known to start growing as early as age 8. Just as individual people differ in scalp hair color, they can also differ in pubic hair color. Differences in thickness, growth rate, and length are also evident.

  8. Dermis - Wikipedia

    en.wikipedia.org/wiki/Dermis

    The dermis is composed of three major types of cells: [3] fibroblasts, macrophages, and mast cells.. Apart from these cells, the dermis is also composed of matrix components such as collagen (which provides strength), elastin (which provides elasticity), and extrafibrillar matrix, an extracellular gel-like substance primarily composed of glycosaminoglycans (most notably hyaluronan ...

  9. Inner ear regeneration - Wikipedia

    en.wikipedia.org/wiki/Inner_Ear_Regeneration

    Hair cells die of old age, acoustic overstimulation and other traumas. [2] Oxotoxin exposure, such as aminoglycoside antibiotics and cisplatin, is also a major contributor to hair cell death. [7] Because mammals have very limited hair cell regeneration, hearing loss is essentially irreversible and therefore a therapeutic target for regeneration.

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