Imagine that a person breathes in a potentially pathogenic bacterium. What defenses will the bacterium encounter as it travels through the human body? Select all correct choices

A. cilia in the nasal cavity
B. mucus in the lungs (if the bacterium enters
the respiratory tract)
C. digestive enzymes in the stomach (if the
bacterium enters the gastrointestinal tract)
D. phagocytes (if the bacterium enters the
bloodstream)


A,B,C,D

Biology & Microbiology

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