Final answer:
Antigen-antibody complexes need to be cleared from the body to prevent harm, and the complement system helps achieve this. Complement proteins attract phagocytic cells to engulf and destroy the complexes, and they also activate other immune responses such as inflammation.
Step-by-step explanation:
When antigen-antibody complexes form, they need to be cleared from the body to prevent potential harm. The complement system plays a crucial role in this process. Complement proteins can bind to the antigen-antibody complexes and promote their rapid clearing by attracting phagocytic cells, such as macrophages or neutrophils, which can engulf and destroy the complexes. Additionally, complement proteins can activate other immune responses, such as inflammation, to aid in the clearance of the complexes.