Question

A barrier to pathogens is provided by A. melanin. B. collagen. C. sebum. D. keratin.

Answer 1

Answer;

Keratin

Explanation;

• The skin contains the protein keratin, which resists physical entry into cells.
• Keratin helps to adhere cells to each other and to form a protective layer on the outside of the skin. In epithelial cells, keratin proteins inside the cell attach to proteins called desmosomes on the surface.
• Keratin makes our skin tough and provides us with much-needed protection from microorganisms, physical harm, and chemical irritation.