Integumentary System mostly Skin Why do you need

Integumentary System= mostly Skin. Why do you need this? ? Section 21 -4 Pg. 591 -594

Basic Skin Facts • • Skin is the largest organ in the body Made up of 2 layers

Epidermis -surface layer- very outside part and are actually dead-are rubbed off and continually replaced -Melanin-is found here, this is a pigment that makes your skin darker- this increase when exposed to UV rays (when your outside)

Dermis 2 nd layer, thicker layer, is where the blood vessels, nerves, oil, and sweat glands are found -Fat cells are found underneath this layer, which insulates your body

What are some of the jobs/function of skin? ?

Function/Job of Skin • Protection – Prevents physical, chemical, and diseases

• Sensory response – Nerves-tell pain, temp. , pressure, etc.

• Formation of Vit. D – Is produced when skin is exposed to light – Helps absorb calcium from body

More Function/Jobs of Skin • Regulation of Body Temp. – Blood vessels within skin can hold or release heat – Hair can help keep heat in-getting the Goosebumps – Have 3 million sweat glands-help in releasing heatthrough perspiration-cooling the body

• Excretion of waste – Sweat glands release waste-salt and protein-urea

What happens when skin is damaged? ?

Damage to the skin • When epidermis is damaged- have no cells to replace these for a while. • Can get nerves and blood vessels exposed.

• Don’t have good protection in this area, so bacteria and other items can get into the body.

• Area is red around wound is red, warm to the touch, and discolored- These are all signs of an infection

The End