Question

1. what is phagocytosis in regard to the immune system of humans?

the process by which the immune system responds to an antigen by producing antibodies against it
the process by which eosinophils release a cytotoxin to kill pathogens
the process by which neutrophils ingest a bacterium

Explanation:

Phagocytosis is the process where phagocytes (like neutrophils) engulf and digest pathogens (such as bacteria). Option A describes antibody - mediated immunity (not phagocytosis). Option B is about eosinophil - specific cytotoxic action (not phagocytosis). Neutrophils performing ingestion of bacteria is a classic example of phagocytosis.

Answer:

C. the process by which neutrophils ingest a bacterium