Bacteria Viruses Innate response Physical Cytokines Cilia barriers Antimicrobial secretions Mucous membranes Macrophages Acquired response Macrophages Cellular response present antigens Humoral response T cells B cells Cytokines Memory B cells Cytotoxic T cells Plasma cells Antibodies Bacteria Viruses Acquired response Mucous membranes Physical barriers Cilia Innate response Cytokines Antimicrobial secretions Macrophages Macrophages present antigens Cellular response T cells Cytokines Cytotoxic T cells Humoral response B cells Memory B cells Plasma cells Antibodies