Question

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the following events occur in the life of a keratinocyte. place them in chronological order starting with what happens first (top box) and ending with what happens last (bottom box).
instructions
keratinocytes die.
dead keratinocytes flake off the surface of the skin as dander.
stem cells divide to produce new keratinocytes.
keratinocytes flatten and produce waterproof bundles of keratin filaments.
mitosis ceases as epidermal cells are pushed upward.

Explanation:

Keratinocytes start as new cells produced by stem - cell division. Then, as epidermal cells are pushed upward, mitosis ceases. After that, keratinocytes flatten and produce keratin filaments. Eventually, they die and then the dead cells flake off as dander.

Answer:

1. Stem cells divide to produce new keratinocytes.
2. Mitosis ceases as epidermal cells are pushed upward.
3. Keratinocytes flatten and produce waterproof bundles of keratin filaments.
4. Keratinocytes die.
5. Dead keratinocytes flake off the surface of the skin as dander.