All of the Following are Physical Barriers to Pathogens, Except

Question

All of the following are physical barriers to pathogens, except ______.
A) mucous
B) unbroken skin
C) tears
D) hairs
E) T cells

Accepted Answer

T cells are a part of the adaptive immune system, not a physical barrier. They are involved in the immune response to pathogens, rather than acting as a physical barrier like mucous, skin, tears, and hairs do.