A patient with a persistent and debilitating cough is confused that his physician has prescribed codeine. He tells the nurse, "I was sure that codeine was a narcotic that people take for pain
" The nurse should cite what mechanism of action when describing this use of codeine? A) Depression of the cough center in the medulla oblongata
B) Vasodilation of the alveolar capillaries
C) Stimulation of the reticular activating system (RAS)
D) Desensitization of the cough receptors in the sinuses and trachea
A
Feedback:
Antitussives such as codeine suppress cough by depressing the cough center in the medulla oblongata. They do not influence blood flow or desensitize peripheral cough receptors. The RAS is not involved in the cough reflex.
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