Infection controlQuestion 195 of 1700
Which substance in the top layer of skin makes it tough and resists bacteria?
- Mucus
- Cilia
- Collagen
- Keratin
Show answer
Correct answer: Keratin
Keratin fills the epidermis cells.
Source: Nursing Assistant (Reuter), 4.3: Defenses Against Transmission of Infection
Questions last reviewed: 18 October 2026