ch. 6 section 3 skin
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Ch. 6 Section 3 Skin. Michelle Napier. the largest organ of our body made up of 3 basic layers. 1. skin. 2. layers of skin. epidermis- outermost layer dermis- middle layer fatty layer- innermost layer. cells are dead and water repellant - PowerPoint PPT PresentationTRANSCRIPT
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CH. 6 SECTION 3SKIN
Michelle Napier
![Page 2: Ch. 6 Section 3 Skin](https://reader036.vdocument.in/reader036/viewer/2022062520/56815f63550346895dce51e5/html5/thumbnails/2.jpg)
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
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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
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5. dermis -thicker than the epidermis- contains blood vessels, nerves, muscles, oil, and sweat glands- holds fat
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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
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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
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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
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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
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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