21. The Immune System
First-Line Defenses: Chemical Barriers
Multiple Choice
Multiple ChoiceComplement proteins work by __________.
A
producing antibodies
B
forming pores in the membranes of target cells
C
phagocytosis of target cells
D
creating an impermeable barrier
E
neutralization of antigens
827
views
Related Videos
Related Practice
Showing 1 of 19 videos