Educational worksheet on the skin's basic structure and functions, part of an anatomy and physiology review.

Here are the correct answers to complete your review sheet on The Skin.

1. Complete the following statements:
1. collagen (This is the main protein in the dermis that provides strength.)
2. keratinocytes (These cells produce keratin, which makes the skin tough and waterproof.)
3. epithelium (The epidermis is made of epithelial tissue.)
4. melanocytes (These specialized cells produce melanin pigment.)

2. Name four protective functions of the skin:
*(Note: Your handwritten answers are correct. Here is the standard list)*
* Protection from mechanical damage (abrasion/cuts)
* Protection from chemical damage
* Protection from thermal damage (heat/cold)
* Protection from bacterial invasion (and UV radiation/dehydration)

3. Using the key choices, choose all responses that apply:

1. papillary layer, reticular layer
*(Both layers contain blood vessels and nerve endings/sacs).*
2. stratum corneum
*(This is the outermost layer composed of dead, flat cells).*
3. papillary layer
*(This is the upper, thinner layer of the dermis).*
4. dermis
*(Blood vessels are located here; the epidermis has no blood supply).*
5. epidermis
*(Nails and hair grow out of follicles rooted in the epidermis).*
6. stratum basale
*(This is the deepest layer where cell division/mitosis happens).*
7. stratum corneum
*(This is the surface layer you can touch).*
8. reticular layer
*(This deeper layer contains dense connective tissue with elastic and collagen fibers).*
9. stratum basale
*(Melanocytes are found in this bottom layer to protect dividing cells).*
10. stratum spinosum
*(This "prickly" layer is usually the thickest part of the epidermis).*