Question

What combines to form a protective barrier layer on the stratum corneum?

A) Sebum and sweat
B) Melanin and keratin
C) Collagen and elastin
D) Blood vessels and nerve endings

Answer 1

The stratum corneum, the outermost layer of the epidermis, is formed by the combination of keratinocytes and keratin.

Step-by-step explanation:

The stratum corneum, the outermost layer of the epidermis, is formed by the combination of keratinocytes and keratin. Keratinocytes are epithelial cells that produce keratin, a tough, fibrous protein. As new keratinocytes form at the bottom of the epidermis, they become filled with keratin and move upward toward the surface of the skin, where they create a protective, waterproof layer called the stratum corneum.