0The lungs are protected from infection because
A - mucus traps bacteria which the cilia then move out of the lungs
B - cilia trap bacteria which the mucus then remove from the lungs
C - cilia trap bacteria which the mucus then destroy
D - mucus traps bacteria which the cilia then destroy
Answer:
A
Question was designed to challenge the misconception that the cilia trap bacteria and to reinforce that trapped bacteria are dealt with elsewhere e.g. swallowed to stomach.