Question

83 Exercise 7 The Integumentary System 4. Compare the functions of the stratum corneum of a human and the bark of a tree. 5. Compare and contrast the features of the stratum corneum in the thin skin and thick skin. 6. You fall off your skateboard and scrape your knee. After checking your injury, you note that you are not bleeding. What layers of the integument are the most damaged? Which layers are not? 7. Speculate on the reasons for differences in skin texture and hair between men and women. 8. Speculate on the reasons for the absence of hair on the ventral surface of the hand (palm). 9. Think about all the times you have put on gloves, a hat, a scarf, or sat down on a chair. How long does it take for you to stop noticing that those items are in contact with your skin? Describe the principle that is in operation when you no longer sense that contact. 10. Again, consider all the times you have put ou gloves, a hat, a scarf, or sat down on a chair. Does the sensation and your awareness of contact persist longer if the chair or clothing is hard, rough, or otherwise uncomfortable? Propose a reason for this. (Hint: Are all sensations equal with regard to receptor adaptation?) 11. Hair, nails, and the epidermis of the skin are all mostly made of keratin, but are different with regard to durability. What does this suggest about the nature of the keratin produced in different areas of the body?

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Answer 1

Solution

Ans 4 The stratum corneum is the outermost protective layer and is composed of dead cells that provide protection from mechanical injury, entry of microbes.

Bark of tree is also composed of dead cells that are protective in function

Ans 5 . The epidermis in thin skin is made of four layers that is stratum basale, stratum spinosum, stratum granulosum and stratum corneum.

The epidermis bin thick skin like palms and soles is made of five layers that is stratum basale, stratum spinosum, stratum granulosum , stratum corneum and stratum lucidium

Ans 5 The epidermis is damaged