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(A) Pharynx
(B) Larynx
(C) Trachea
(D) Nasal cavity
252. What keeps the trachea open?
(A) Muscles
(B) Cartilaginous rings
(C) Epiglottis
(D) Bronchi
253. Where does air go after the larynx?
(a) Pharynx
(b) Esophagus
(c) Trachea
(d) Nasal cavity
254. What prevents food from entering the trachea?
(A) Larynx
(B) Pharynx
(C) Epiglottis
(D) Bronchi
255. Where do bronchi lose their cartilage?
(A) Trachea
(B) Nasal cavity
(C) Bronchioles
(D) Alveoli
256. Where does gas exchange occur?
(A) Pharynx
(B) Bronchioles
(C) Trachea
(D) Alveoli
257. What is the role of the nasal mucous membrane?
(A) Absorb oxygen
(B) Produce sound
(C) Filter and warm air
(D) Transport food
258. How many rings does the trachea have?
(A) 10 to 15
(B) 21 to 25
(C) 16 to 20
(D) 26 to 30
259. Where does air go after bronchioles?
(A) Larynx
(B) Pharynx
(C) Alveoli
(D) Trachea
260. The pharynx connects which two parts?
(A) Nasal cavity and larynx
(B) Larynx and trachea
(C) Bronchi and alveoli
(D) Trachea and bronchioles
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