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Chapter 15 Lesson 1 Integumentary System Slide 2 Functions of the Skin Your skin is the primary organ of your Integumentary system This system includes, Skin, Hair, nails, Sebaceous glands, Sweat glands Slide 3 Functions of the Skin Skin Provides these vital functions 1. Providing a protective covering for your body - Skin acts as a barrier between your internal organs and the outside world - shields from injury, pathogens, ultraviolet rays - Helps maintain the bodys balanceof fluid and electrolytes Slide 4 Functions of the Skin 2. Regulating body temperature - Helps keep body temperature constant - When body hot, tiny blood vessels enlarge permitting heat to escape (radiation) -Sweat glands become active, releasing perspiration, which cools the skin, dropping the body temperature Slide 5 Functions of the Skin 3. Enabling you to sense the world around you - Skin is a major sense organ that serves as a means of communication with the outside environment - Nerve endings in your skin are responsive to touch, pain, pressure, and temperature Slide 6 Structure of the Skin Skin Has 2 main layers Epidermis The outer, thinner layer of skin Dermis The thicker inner layer Slide 7 Epidermis Made up of both living and dead cells Form a tough protective coating Epidermis contains a fatty substance called lipids that makes the skin waterproof When dead cells shed replaced by new cells Some cells produce Melanin Pigment that gives skin, hair, eyes their color The more Melanin the greater protection from the sun and ultraviolet rays that have been connected to cancer Slide 8 Dermis Made up of connective tissue that gives the skin its elasticity Nerve endings and hair follicles extend into the dermis So do the sweat glands and sebaceous glands Below the dermis is tissue called the hypodermis. It is not part of your skin, but it attaches the skin to bone and muscle Slide 9 Skin Care Slide 10 Good personal hygiene land a balanced eating style promote healthy skin Daily washing, bathing, or showering slows the growth of bacteria that causes body odor Vitamin A helps promote healthy skin Milk, egg yolks, liver, green leafy and yellow vegatables and yellow fruits Slide 11 Problems of the Skin Slide 12 Ring worm Slide 13 Ring worm is a common fungal infection that affects various parts of the body It gets its name from the ring shaped, scaly reddened or blistery patches Slide 14 Athletes foot Slide 15 The same fungus that causes ringworm causes athletes foot Fungal infection between the toes Associated with wearing shoes and sweating Highly contagious Slide 16 Boils Slide 17 An inflamed, pus filled area of the skin, usually an infected hair follicle Cause is Staphylococcus aureus Keeping skin clean helps prevent boils Never squeeze or burst a boil; this can spread the infection Boils can be serious and if large, should be treated by a doctor Slide 18 Warts Slide 19 Contagious growths on the outer layer of the skin Most are painless an harmless, but the virus that causes them can spread to other parts of the body and form more warts Slide 20 Moles Slide 21 Moles are small, usually round, slightly thickened brown to dark brown spots on the skin Usually harmless If mole suddenly appears, grows, bleeds, or changes color, shape consult a physician immediately Slide 22 Psoriasis Slide 23 Skin disease in which thickened paths of inflamed, red skin form, often covered by white, flaking scales Should be treated by a physician Cause not known but can be a lifetime skin problem if not treated Slide 24 Vitiligo Slide 25 Disorder in which patches of skin lose their color The affected areas are extremely sensitive to sunlight and should be protected Believed to be an auto immune disorder that causes an absence of the skin cells that produce melanin No cure, but about 30% of cases the color returns on it own Slide 26 Impetigo Slide 27 A streptococcal infection in which bacteria enter a small break in the skin This infection is highly contagious Slide 28 Blisters Slide 29 Raised area filled with a watery fluid They usually result form the skin being rubbed against the inside of your shoe Burns may blister also Keep it from breaking and leave t heal on its own Slide 30 Callus Slide 31 Area of thickened skin that forms as a result of regular or continued friction Musicians who play stringed instruments often develop calluses on their fingers Calluses can be reduced by rubbing them with a porous stone called pumice Slide 32 Corn Slide 33 Callus on toe caused by the pressure of a tight fitting shoe Spongy corn pads can relieve the pressure that makes corns painful Wearing shoes that fit properly is the main way to prevent corns