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The Skin? What does it do?.

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Presentation on theme: "The Skin? What does it do?."— Presentation transcript:

1 The Skin? What does it do?

2 What is skin? Skin is the largest organ of the body
It’s purpose is to give a tough, flexible covering to the body Divided into 3 main sections Epidermis – the top layer Dermis – middle layer Subcutaneous layer – the bottom layer Skin has the following functions:

3 Sensation Skin lets us feel: Touch Pressure Pain Heat Cold
Recognise objects by feel and shape

4 Heat regulation Temperature control
Normal body temperature is 36.8°C Blood supply & sweat glands mainly control body heat loss. Heat can be distributed by blood circulation to the body Sweating also helps control heat by lowering temperature

5 Absorption Skin acts as a waterproof barrier
UV rays are absorbed stimulating melanin production The nicotine in patches is absorbed

6 Protection Outer skin surface protects against bacteria by forming the Acid Mantle (sebum & sweat) Prevents absorption by creating a barrier Acts as a cushion for underlying structures Acts as a waterproof coating preventing vital water loss Contains Melanin which absorbs UV rays – Tanning

7 Elimination/Excretion
Sweating helps get rid of waste products like water and salt through the surface of the skin 2 types of sweat, 1 happens all the time and you don’t know about it. The other only when you are hot or stressed

8 Nutrition Storage for fat, providing an energy store.
Produces Vitamin D – chemical reaction when sunlight is in contact with the skin


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