EXCRETORY SYSTEM
EXCRETORY SYSTEM ALL QUESTIONS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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The cells that make up the epidermis are both living and
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alive
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dead
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yellow
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brown
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Explanation:
Detailed explanation-1: -NARRATOR: The epidermis consists of living and nonliving layers. The cells immediately in contact with the dermis, close to the nourishing blood supply, are alive. These cells divide, new ones pushing older ones away from the dermis.
Detailed explanation-2: -1st epidermis layer. Exposed surface of both thin and thick skin. Normally 15-30 layers of keratinized cells. Composed of dead cells called keratinocytes.
Detailed explanation-3: -Keratinocytes are the predominant cell type of epidermis and originate in the basal layer, produce keratin, and are responsible for the formation of the epidermal water barrier by making and secreting lipids.
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