Presentation on theme: "Integumentary System Consists of Largest organ of the human body the"— Presentation transcript:
1 Integumentary System Consists of Largest organ of the human body the skinhairglandsnailsLargest organ of the human body theSkin accounts for 16% of the bodies mass!
2 Functions Protection—first line of defense Communication Disease (micro-invaders)Loss of fluidsPhysical injuryUV LightRegulation of TempSweatInsulationBlood supplyCommunicationReceptorsHot/coldPainTouch
3 Functions Vitamin D Production Calcium absorption Excretion of Wastes For bonesFor muscle contractionExcretion of Wastessweat
4 The Layers of the Skin Skin Cross Section Epidermis Dermis Dermis Subcutaneous(Hypodermis)
5 The epidermis is divided into two layers, dead and living cells.
6 EpidermisLiving cells of the epidermis replicate, pushing their way towards the surface.The cells flatten and the organellesdisintegrate.Eventually the living cells of theinner epidermis become the dead,tough, waterproof, and flexibleouter layer.
7 Epidermis As the living cells replicate they produce keratin and melanin.Keratintough fibrous proteinfor strength and a waterproof texture.Melanindark brown pigmentaccounts for the variations in skin color.
10 Subcutaneous tissueLayer of fatInsulationFood reserve
11 Glands of the Dermis Two major types Sweat glands Sebaceous glands Eccrine- thin and wateryApocrine- thick, kicks in at pubertySebaceous glandsSebum- an oil that coats the surface of the skinflexibility and waterproofingHair Follicle
12 Finger and ToeNailsNails grow rapidly from the nail root.During cell division the nail root fills with keratinproducing a plate-like nail.Fingernails grow 4 timesfaster than toe nails withan average rate of 3 millimetersper month.
13 What to KnowFunctions of Integumentary system.The layers of the skin.Various components of the epidermis and dermis, including the nails.