5 Number the following structures of the respiratory tract in the proper order. The structure that comes into contact with oxygenated air first should be number 1, and the structures where gas exchange takes place should be number 11. Oropharynx Trachea Nasal cavity Bronchiole Alveolar sac Larynx Nasopharynx Bronchi Terminal bronchiole Laryngopharynx Respiratory bronchiole 6 The piece of elastic cartilage that seals off the larynx during swallowing is called the a. uvula. b. false vocal cord. c. true vocal cord. d. epiglottis.

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