Which pathway of complement activation acts in conjunction with the action of antibodies? А. the lectin pathway В. the alternative pathway C. the classical pathway D. the attack pathway

Microbial products trigger macrophage activation. Match the receptor with the product that it binds. ✓ TLR-4 ✓ TLR-3 ✓ TLR-9 TLR-5 A. Unmethylated DNA B. Double-stranded RNA C. LPS D. Flagella

In the blanks on the left, place the letters of all oi ure nOst defenses and immune responses in the right column that can fit the description. .vaccination for tetanus a. active . lysozyme in tears b. passive c. natural d. artificial e. acquired f. innate, inborn g. chemical barrier immunization with horse serum in utero transfer of antibodies .booster injection for diphtheria -colostrum - interferon action of neutrophils injection of gamma globulin - recovery from a case of mumps edema h. mechanical barrier i. genetic barrier j. specific k. nonspecific 1. inflammatory response humans having protection from canine distemper virus stomach acid m. second line of defense - cilia in trachea

C4a     A. functions as an opsonin   B. binds to the surface of an antigen   C. is immediately inactivated once formed   D. binds to the surface of immune cells   E. is the large subunit of C4