The Human Body- Unit 7

Term Definition
The Integumentary System A collection of organs working together to help your body maintain a healthy internal environment (skin, hair, nails)
What does your skin do? 1. protects
2. keeps you "in touch"
3. temperature regulation
4. removes waste
How does your skin protect? It keeps foreign particles out.
How does your skin keep you "in touch"? Nerve endings in your skin allow you to feel what's around you.
How does your skin regulate temperature? Sweat glands produce sweat- which cools you down when it evaporates.
How does your skin remove waste? Several chemicals from the bloodstream are waste. They are removed through sweat.
What gives your skin color? Melanin
Melanin A darkening chemical in the skin.
More melanin =
Less melanin =
More melanin = darker skin
Less melanin = lighter skin
Name the 2 layers of the skin. 1. Epidermis
2. Dermis
Epidermis The upper, thinnest layer of epithelial tissue.
Cells are dead and it is made up of keratin, which makes skin tough.
Dermis The lower, thicker layer of connective tissue.
What does the Dermis contain? blood vessels, nerves, muscle fibers, hair follicles, oil glands, seat glands and collagen
Collagen It provides strength and flexibility
Where is hair produced? At the hair follicle
Melanin Gives hair its color

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