Hair is a keratinous filament growing out of the epidermis. It is primarily made of dead, keratinized cells. Strands of hair originate in an epidermal penetration of the dermis called the hair follicle. The hair shaft is the part of the hair not anchored to the follicle, and much of this is exposed at the skin’s surface. The rest of the hair, which is anchored in the follicle, lies below the surface of the skin and is referred to as the hair root. The hair root ends deep in the dermis at the hair bulb, and includes a layer of mitotically active basal cells called the hair matrix. The hair bulb surrounds the hair papilla, which is made of connective tissue and contains blood capillaries and nerve endings from the dermis.
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A conductor is a material which contains movable electric charges, An insulator is a material that has a large band gap, or a large energy difference between the valence and conduction band, And a metalloid is a chemical element that exhibits some properties of metals and some of nonmetals.
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Eukaryotes grow and reproduce through a process called mitosis. ... Most prokaryotes reproduce asexually and some through a process called binary fission. During binary fission, the single DNA molecule replicates and the original cell is divided into two identical daughter cells.
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<span>Cell, Tissue, Organ, Organ System</span>
