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