ch. 6 section 3 skin
Post on 17-Feb-2016
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CH. 6 SECTION 3SKIN
Michelle Napier
1. skin -the largest organ of our body- made up of 3 basic layers
2. layers of skin
1. epidermis- outermost layer2. dermis- middle layer3. fatty layer- innermost layer
3. epidermis -cells are dead and water repellant- new cells are produced constantly at the base of the epidermis- produces melanin
4. melanin -pigment that protects skin and gives it its color- this is what makes tanning possible
5. dermis -thicker than the epidermis- contains blood vessels, nerves, muscles, oil, and sweat glands- holds fat
6. functions of the skin
-protection- sensory response- vitamin D formation- helps blood absorb calcium- regulates body temperature- helps the body get rid of waste
7. heat and waste exchange
-blood vessels in the skin expand and dilate which releases heat or holds heat in- as they expand, blood flow increases and heat is released- our skin holds about 3 million sweat glands
8. functions of sweat glands
1. regulate body temperature2. release waste- when vessels dilate, pores on the
skin open and perspiration is released from sweat glands. This allows your body to cool off.
- cells use energy and nutrients and have waste which is released through sweat
9. bruises -blood vessels under the skin burst but skin stays in tact- red blood cells leak into tissues and a chemical called hemoglobin is released- hemoglobin is responsible for the different colors of bruises
10. cut -a tear in the skin- scars are formed when large amounts of tissue build up under a cut
11. skin grafts - pieces of skin cut from one part of the body and put on another part that was injured or burned
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