Integumentary System The Skin.

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The Skin Chapter 14 Section 4.

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Presentation transcript:

Integumentary System The Skin

The Body’s Tough Covering Functions of the Skin: 1. Protect the Body 2. Maintaining Temperature 3. Eliminating Wastes 4. Gathering Information 5. Producing Vitamin D

Protecting the Body Forms a Protective Barrier Barrier Purpose Example: Plastic Wrap Barrier Purpose 1. Keep out disease causing microorganisms 2. Keep out harmful substances 3. Keep in water

Maintaining Temperature Blood vessels When the body gets warm the blood vessels enlarge which increases blood flow and heat is given off Sweat glands Excess heat in the body causes perspiration Sweat, evaporation cools the body

Eliminating Wastes Perspiration consists of dissolved waste material from the breakdown of chemicals during cellular processes Examples of wastes: Ammonia, urea, salts, and sugars

Gathering Information Nerves 1. Pressure 2. Pain 3. Temperature

Producing Vitamin D Vitamin D is needed for the growth and development of the bones Cells in digestive system absorb calcium from foods Sunlight A few minutes can create an all day supply of Vitamin D

Main Skin Layers Epidermis Epi- above, over Dermis Means skin

Epidermis Outer layer Thinner than dermis No blood vessels or nerves Replaces itself in about 2 weeks When shedding, bacteria carried away

Dermis Inner layer of skin located under the Epidermis Nerves and blood vessels are found in this layer Structures found in Dermis; Sweat glands Hairs Oil glands

Caring for Your Skin Healthful Diet Keeping Skin Clean Keep it balanced Keeping Skin Clean Limiting Sun Exposure Wear that sun screen