Which of the following is NOT an example of a mechanical or chemical barrier to pathogens?

Question

Quizplus · Accepted Answer

Phagocytes are not a mechanical or chemical barrier, but rather a type of immune cell that engulfs and destroys pathogens. The other options are examples of mechanical or chemical barriers - lysozymes in tears break down bacterial cell walls, acids in the stomach kill ingested pathogens, and tight junctions between epithelial cells form a physical barrier between the external environment and underlying tissues.

Which of the Following Is NOT an Example of a Mechanical