A client has experienced a bout of coughing after aspirating some of his secretions. The client's coughing was triggered by which of the following?
A) Sudden ventilation–perfusion mismatch
B) Sudden rise in PCO2
C) Signals from receptors in the tracheobronchial wall
D) Signals from central chemoreceptors
Ans: C
Feedback:
The cough reflex is initiated by receptors located in the tracheobronchial wall; these receptors are extremely sensitive to irritating substances and to the presence of excess secretions. Blood gas changes and ventilation–perfusion mismatch do not directly initiate the cough reflex.
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