Final answer:
The complement system consists of proteins that form a pore in the membrane of bacteria during the nonspecific immune response.
Step-by-step explanation:
The complement system consists of several proteins that enzymatically alter and fragment later proteins in a series, which is why it is termed cascade. Once activated, the series of reactions is irreversible, and releases fragments that have the following actions:
- Bind to the cell membrane of the pathogen that activates it, labeling it for phagocytosis (opsonization)