Which Statement Correctly Describes the Complement System

Question

Which statement correctly describes the complement system?
A) a set of proteins involved in innate but not acquired immunity
B) a group of proteins that includes interferons and interleukins
C) a group of proteins that act together in a cascade fashion
D) a set of proteins that act individually to attack and lyse microbes

Accepted Answer

The complement system consists of a series of proteins that work together in a cascade fashion to enhance the ability of antibodies and phagocytic cells to clear pathogens from an organism. This system is part of the innate immune system and plays a crucial role in the defense against infections.