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1 The Skin Chapter 14 Section 4. 2 Key concepts  What are the functions and the structures of the skin?  What habits can help keep your skin healthy?

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Presentation on theme: "1 The Skin Chapter 14 Section 4. 2 Key concepts  What are the functions and the structures of the skin?  What habits can help keep your skin healthy?"— Presentation transcript:

1 1 The Skin Chapter 14 Section 4

2 2 Key concepts  What are the functions and the structures of the skin?  What habits can help keep your skin healthy?

3 3 Key Terms EpidermisMelanin DermisPore FollicleCancer

4 4 Skin performs several major functions  Skin covers and protects the body from injury, infection and water loss  Helps regulate body temperature,  eliminate wastes,  gather information about the environment and  produce vitamin D

5 5 Protecting the body  Skin forms a barrier that keeps disease causing microorganisms and harmful substances outside the body  Helps keep important substances inside the body-prevents the loss of fluids such as water

6 6 Maintaining temperature  Help maintain a stead body temperature  Blood vessels run throughout the skin, when you become too warm blood vessels enlarge and the amount of blood that flows through them increases  This allows heat to move from your body to the outside environment  Sweat glands produce perspiration in response to excess heat

7 7 Eliminating wastes  Perspiration contains dissolved waste materials

8 8 Gathering information  Skin gathers information about the environment

9 9 Producing vitamin D  Vitamin D is important for healthy bones because it helps the cells in your digestive system absorb the calcium in your food

10 10 Epidermis  Outer layer of the skin  Thinner than the dermis  Does not have nerves or blood vessels  Each epidermal cell begins life deep in the epidermis, where cells divide to form new cells  New cells mature and move upward  After two weeks the cells die and become part of the epidermal surface layer  Cells remain in this layer for about two weeks they are then shed and replaced by the dead cells below

11 11 Epidermis function  Most of the protection provided by the skin is due to the layer of dead cells on the surface  Cells deep in the epidermis produce melanin a pigment or colored substance that gives skin its color. The more melanin in your skin the darker it is

12 12 Dermis  Located below the epidermis and above a layer of fat  This fat layer pads the internal organs and helps keep heat in the body  Contains nerves and blood vessels  Contain sweat glands, hairs and oil glands

13 13 Caring for your skin  How can you help keep your skin healthy? –Eat a healthful diet-well balanced diet provides the energy and raw materials needed –Keep your skin clean and dry-wash your skin with mild soap and get rid of dirt and harmful bacteria –Limit your exposure to the sun-repeated exposure to the sun can cause cancer


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