integumentary system consists of consists of skin skin hair hair glands glands nails nails largest...

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  • Integumentary SystemConsists of skinhair glandsnails

    Largest organ of the human body the Skin accounts for 16% of the bodies mass!

  • FunctionsProtectionfirst line of defenseDisease (micro-invaders)Loss of fluidsPhysical injuryUV Light

    Regulation of TempSweatInsulationBlood supplyCommunicationReceptorsHot/coldPainTouch

  • Vitamin D ProductionCalcium absorptionFor bonesFor muscle contraction

    Excretion of WastessweatFunctions

  • Subcutaneous(Hypodermis) DermisEpidermisDermisSkin Cross Section

  • EpidermisThe epidermis is divided into two layers, dead and living cells.DeadLiving

  • Living cells of the epidermis replicate, pushing their way towards the surface.

    The cells flatten and the organelles disintegrate.

    Eventually the living cells of the inner epidermis become the dead, tough, waterproof, and flexible outer layer.

  • As the living cells replicate they produce keratin and melanin.

    Keratin tough fibrous protein for strength and a waterproof texture.

    Melanin dark brown pigment accounts for the variations in skin color.

  • Dermisblood vessels nerve endings glands sense organs smooth muscles hair follicles. Epidermis

  • Skin Cross Section

  • Subcutaneous tissueLayer of fatInsulationFood reserve

  • Two major types Sweat glandsEccrine- thin and wateryApocrine- thick, kicks in at pubertySebaceous glands Sebum- an oil that coats the surface of the skin flexibility and waterproofingHair Follicle

  • Nails grow rapidly from the nail root.

    During cell division the nail root fills with keratin producing a plate-like nail.

    Fingernails grow 4 times faster than toe nails with an average rate of 3 millimeters per month.

  • Functions of Integumentary system.

    The layers of the skin.

    Various components of the epidermis and dermis, including the nails.