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Key for which region of the spine receives

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key for which region of the spine receives information from the skin).HairHair(Figure 7.8)is made up of two parts: the root (in the dermis layer) and the shaft. The root begins at thehair bulb, which has blood and nervous supply. Theshaftextends through the epidermis to the externalsurface of the skin. Hair is made up of dead epidermal cells which are converted to keratin, giving hair itsstronger texture compared to skin cells. A sebaceous gland is found at the root of each hair follicle, helpingto hydrate hair with oil. Each hair follicle is connected anarrector pili muscle, a smooth muscle whichcontracts when the body is cold or experiences emotional responses. Hair follicles are found throughout theskin surface and are susceptible to circulating hormones. For example, hair follicles in the armpits, groin andhead change their properties after puberty.
2/22/19, 9’51 PMNursingABC - ModulePage 8 of 21Figure 7.8 Hair follicles.NailsNails(Figure 7.9)are also composed of dead epidermal cells that are converted to keratin. New cells areconverted at the nail root and are pushed towards the external surface in the direction of the nail body. Thenail bodyis the visible portion of a nail, covering the epidermis in that region, called a nail bed. Thenailrootis not visible. The stratum corneum of the epidermis extends from the nail root covering the visibleportion of the nail, called thecuticle. Thelunulais the visible portion of the nail bed near the nail root, whichis typically crescent shaped (and most visible on the thumbs).
2/22/19, 9’51 PMNursingABC - ModulePage 9 of 21Figure 7.9 Cross section of a nail root and nail body.Physiology of the Integumentary System: RepairThe smallest unit of life is a cell. Cells come together to form tissues.Tissuesare comprised of cells whichare similar in structure and function. Tissues are comprised of cells andmatrix. Matrix is also calledextracellular material, made up of ground substance (extracellular fluid), protein and collagen fibers. Whenthe skin is damaged, both tissue and matrix need to be repaired.Tissue repairIn the case of tissue damage, the body needs to respond quickly prevent blood loss in and microorganismsfrom entering the bloodstream. Tissues, such as the skin, can be repaired by the body through a multi-stepprocess(Figure 7.10). Bloodplatelets(Figure 7.11)from the broken blood vessel start to accumulate in thearea where the tissue was damaged, forming aclot, secreting a mesh-like substance around it to preventblood loss(Figure 7.11).
2/22/19, 9’51 PMNursingABC - ModulePage 10 of 21

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Term
Spring
Professor
Rebekah Stepp
Tags
Stratum Corneum

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