Question
Question 3 of 32 The trachea and bronchi secrete __ which traps pathogens. What is the missing word in this sentence? Enter your answer
Answer
4.1
(206 Votes)
Fletcher
Master · Tutor for 5 years
Answer
mucus
Explanation
This question tests your knowledge of the respiratory system and the bodily defenses against pathogens. The answer is 'mucus'. The trachea and bronchi are lined with ciliated cells secreting mucus. This moist, sticky substance traps small particles, including pathogens such as bacteria or viruses, preventing them from reaching deeper into the respiratory system. Hence, mucus substitutes the underlined space in the phrasing of the particular question.