1. The stratum corneum a. has stem cells b. is outermost layer of the skin c. is
ID: 3512203 • Letter: 1
Question
1. The stratum corneum a. has stem cells b. is outermost layer of the skin c. is the thinnest layer of the skin d. has abundant melanocytes and dendritic cells 2. Mitosis occurs primarily in which stratum of the epidermis? a. stratum corneum b. stratum basale c. stratum lucidum d. stratum spinosum 3. The touch sensors of the epidermis are the . a. tactile cells b. keratinocytes c. melanocytes d. dendritic cells 4. What waterproofing protein is found in the epidermis? a. carotene b. collagen c. keratin d. melanin 5. Melanocytes and keratinocytes work together in protecting the skin from UV damage when keratinocytes a. accumulate melanin granules, forming a pigment shield b. provide the melanocyte with a protective shield against abrasion c. maintain the appropriate pH for the melanocyte to synthesize melanin granules d. maintain the appropriate temperature so the product of the melanocyte will not denature 6. This layer of the skin is responsible for our fingerprints. a. reticular b. epidermis c. hypodermis d. papillary 7. The reason the hypodermis acts as a shock absorber is that a. it is located just below the epidermis and protects the dermis from shock b. it has no delicate nerve endings and can therefore absorb more shock c. the cells that make up the hypodermis secrete a protective mucus d. its major makeup is adipose, which serves as an effective shock absorber 8. The sweat glands that are important in body temperature regulation are the a. eccrine b. apocrine c. ceruminous d. sebaceous glands.Explanation / Answer
1) b- stratum corneum is the outermost layer of skin.
It consists of dead cells not stem cells.
2) b- stratum basale is the layer of epithelium where mitosis takes place exclusively. Then the cells goes to the upper layers and eventually sheds off.
3) a- tactile cells are the touch sensors of epidermis. They are also known as Merkel cells. Keratinocytes secrete keratin (protein). Melanocytes secrete melanin (pigment). Dendritic cells. Dendritic cells are antigen presenting cells.
4) c- keratin is the waterproofing protein. Keratin is tough protein. It is secreted by keratinocytes
5) a- accumulate the melanin granules forming a pigment shield.
6) d- papillary layer. It is the layer of dermis. It produces fingerprints as it is present just beneath the epidermis and connects it via papillae.
7) d- it is made up of adipose tissue ( fat cells) they act as shock absorber.
8) a- eccrine gland helps in body temperature maintenance.
On increase of temperature these glands release water to the surface of skin which later gets evaporated leading cooler skin.
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