- A Secreting antibodies directly into the bloodstream
- B Phagocytosis (engulfing and digesting pathogens)
- C Releasing antiviral interferon signaling proteins
- D Raising local tissue temperature to kill germs
Correct answer: B. Phagocytosis (engulfing and digesting pathogens)
Explanation: Neutrophils are the most abundant WBCs and are the first to arrive at infection sites. They engulf pathogens by phagocytosis, trapping them in phagosomes that fuse with lysosomes containing digestive enzymes.
Concept context
Innate and adaptive immunity, B cells, T cells, antibodies, vaccines, and immune disorders. Critical for NEET.