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18. Which is the correct order through which air passes during inhalation?
a) trachea, bronchiole, bronchus, all
b) trachea, bronchus, bronchiole, alveolus
alveolus, bronchiole, bronchus, trachea
d) alveolus, bronchus, trachea, bronchiole
19. Which of the following takes place when a person breathes in?
The rib cage rises and the diaphragm rises
The rib cage rises and the diaphragm lowers
The rib cage lowers and the diaphragm rises
d)
The rib cage lowers and the diaphragm lowers
20. Much of the respiratory system is lined with hair-like cilia. The function of cili
a) filter out dust and other debris
b act as a noise-making device
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