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doug-alh122-chapter7
Doug, ALH122, Chapter 7
| Question | Answer |
|---|---|
| What is the largest organ of the body? | Skin |
| Skin is made up of 3 layers, name them. | Epidermis, Dermis, Sub-cutaneous |
| What is the top layer of your skin made up of? | A hard fibrous protein called keratin. |
| What forms whorls and patterns that make our fingerprint? | keratin |
| As surface cells exfoliate, how often are they replaced? | Every 30-45 days |
| Which layer of the skin are melanocytes in? | Epidermis |
| What are melanocytes? | Pigment producing cells |
| What is the Dermis layer of the skin made up of? | Collagen and elastin |
| What is contained in the Dermis layer of the skin? | Blood vessels, nerves, hair follicles, sweat and oil glands |
| What is the subcutaneous layer of the skin made up of? | Fat tissue |
| Which layer of the skin is filled with fat globules, blood vessels and nerves. | Subcutaneous |
| What are sweat glands? | Tiny coiled tubes in the dermis that secrete sweat to coll the body during evaporation. |
| What does Integument mean? | Skin |
| What is the Integumentary system made up of? | Skin, hair, nails |
| What are sebaceous glands? | Oil producing glands, located in or near hair follicles which produce oil (sebum) to prevent hair and skin from being dry and brittle |
| What is hair made up of? | Keratin |
| What are the 3 things that make up hair? | Root, follicle or sac, and a hair shaft. |
| What is the musle called that is attached to each hair? | Erector Muscle |
| What does the erector muscle do? | Reacts to emotion or cold, causing goose bumps and hairs to stand on end. |
| What does a nail consist of? | Nail bed, cuticle, lunula and nail root. |
| Why is young skin so strong, soft, flexible and elastic? | Because of keratin int he epidermis and collagen in the dermis. |
| What happens to your skin with age? | The action of keratin in preventing dehydration decreases, the fat cells in the dermis decrease, and the elastic fibers from collagen decrease causing the development of folds or wrinkles. |
| How do skin and blood work together to regulate body temperature? | They work to gether to dialate vessesl (when warm) or constrict vessels (when cold) |
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dugwhite2
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