Question

multiple choice question
saliva, tears, and mucus, as well as skin and intact mucous membranes are examples of _______, important in innate immunity.
o chemical mediators
o immune cells
o physical barriers

Explanation:

Saliva, tears, mucus, skin and intact mucous membranes prevent pathogens from entering the body physically in innate immunity. They are not chemical mediators (like cytokines) or immune - cells (like lymphocytes).

Answer:

C. physical barriers