Question

complete each sentence by selecting the proper word or phrase from each drop - down.

1. the click to select is made up of multiple layers of dead keratinocytes that regularly exfoliate.
2. the next layer is the stratum lucidum, which is present only on the soles of the feet, hands, fingers, and toes.
3. the click to select is named for the presence of dark staining keratohyalin granules which bind the cytoskeletal keratin filaments together.
4. towards the apical surface, in the click to select, the keratinocytes cease cell division, while at the deeper regions, they can still undergo mitosis.
5. comprised of viable, cuboidal and columnar cells, the click to select contains the keratinocyte stem cells that replenish the exfoliated cells at the surface.

Explanation:

1. The stratum corneum is the out - most layer of the epidermis with dead keratinocytes that exfoliate.
2. Stratum lucidum is a clear layer present only in thick skin areas like soles and palms.
3. Stratum granulosum has keratohyalin granules that bind keratin filaments.
4. In stratum spinosum, keratinocytes stop dividing near the apical surface but can divide deeper.
5. Stratum basale has viable cuboidal and columnar cells including keratinocyte stem cells for cell replenishment.

Answer:

1. stratum corneum
2. stratum lucidum
3. stratum granulosum
4. stratum spinosum
5. stratum basale