Radiation 3 causes dna mutations and burns that lead

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radiation3.Causes DNA mutations and burns that lead to cancer and wrinkles4.Skin color depends on melanin production, not number of melanocytesThe Dermis is located between epidermis and subcutaneous layer.Anchors epidermal accessory structures (hair follicles, sweat glands) Two components
1.Outer papillarylayer2.Deep reticularlayerThe PapillaryLayer consists of areolar tissue and contains smaller capillaries, lymphatics, and sensory neurons1.Has dermal papillae projecting between epidermal ridges (fingerprints)2.Finger prints are example. Projections occur throughout. The ReticularLayer consists of dense irregular connective tissue and contains larger blood vessels, lymphatic vessels, and nerve fibers1.Contains collagen and elastic fibers2.Contains connective tissue proper
Exocrine Glands in Skin:1.SebaceousGlands(oil glands): sometimes called Holocrine glands that secrete sebum2.Two Types of SweatGlands(apocrine and merocrine) that have watery secretions3.Mammaryglands: breast glands that produce milk4.Ceruminousglands: Produce cerumen(earwax) to rotect the eardrumSebaceous(Oil) Glands: simple branched alveolar glands that are associated with hair follicles Sebaceousfollicles: discharge sebum directly onto skin surfaceSebum: contains lipids and other ingredients that help lubricate and protect the epidermis to inhibit bacteriaApocrineSweatGlands: found in armpits, around nipples, and groin that secrete products into hair folliclesProduce sticky, cloudy secretions Break down and cause odorsSurrounded by myoepithelialcells: squeeze apocrine gland secretions onto skin surface in response to hormonal or nervous signalMerocrine(Eccrine) SweatGlands: widely distributed on body surface (especially on palms and soles)Coiled, tubular glands that discharge directly onto skin surface (sensible perspiration)Water, salts, and organic compoundsFunctions of merocrine sweat gland activity: cools skin; excretes water and electrolytes; and flushes microorganisms and harmful chemicals from skinNails functions in:
Protect fingers and toesMade of dead cells packed with keratin Nail ProductionOccurs in a deep epidermal fold near the bone called the nailrootStructure of a Nail:Nailbody: the visible portion of the nail that overs the nailbedLunula: the pale crescent at the base of the nailSides of nailsLie in lateralnailgrooves

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