Keratin is an intracellular fibrous protein that gives hair, nails, and skin their hardness and this?

• Correct Answer: water-resistant properties
• friction resistant properties
• heat resistant properties
• cold - resistant properties

Explanation: The cells in all of the layers except the stratum basale are called keratinocytes. A keratinocyte is a cell that manufactures and stores the protein keratin. Keratin is an intracellular fibrous protein that gives hair, nails, and skin their hardness and water-resistant properties. The keratinocytes in the stratum corneum are dead and regularly slough away, being replaced by cells from the deeper layers (Figure 5.4).

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