GENERAL HISTOLOGY

Detailed explanation-1: -Innate immune cells recognize certain molecules found on many pathogens. These cells also react to signaling molecules released by the body in response to infection.

Detailed explanation-2: -RB: T cells can play different roles. They can act as “killer cells”, attacking cells which have been infected with a virus or another kind of pathogen, or they can act as “helper cells” by supporting B cells to produce antibodies.

Detailed explanation-3: -T and B cells exhibit a common theme of recognition/binding of specific antigens via a complementary receptor, followed by activation and self-amplification/maturation to specifically bind to the particular antigen of the infecting pathogen.