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  2. Epidermis - Wikipedia

    en.wikipedia.org/wiki/Epidermis

    The epidermis is the outermost of the three layers that comprise the skin, the inner layers being the dermis and hypodermis. [1] The epidermal layer provides a barrier to infection from environmental pathogens [2] and regulates the amount of water released from the body into the atmosphere through transepidermal water loss.

  3. Ground tissue - Wikipedia

    en.wikipedia.org/wiki/Ground_tissue

    "The ground tissue of plants includes all tissues that are neither dermal nor vascular. It can be divided into three types based on the nature of the cell walls. 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 ...

  4. 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 ...

  5. Human hair growth - Wikipedia

    en.wikipedia.org/wiki/Human_hair_growth

    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]

  6. Tissue (biology) - Wikipedia

    en.wikipedia.org/wiki/Tissue_(biology)

    In addition to this protective function, epithelial tissue may also be specialized to function in secretion, excretion and absorption. Epithelial tissue helps to protect organs from microorganisms, injury, and fluid loss. Functions of epithelial tissue: The principle function of epithelial tissues are covering and lining of free surface

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

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

    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 ...

  8. Epidermis (botany) - Wikipedia

    en.wikipedia.org/wiki/Epidermis_(botany)

    The epidermis is the outermost cell layer of the primary plant body. In some older works the cells of the leaf epidermis have been regarded as specialized parenchyma cells, [1] but the established modern preference has long been to classify the epidermis as dermal tissue, [2] whereas parenchyma is classified as ground tissue. [3]

  9. 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.

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