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One such reflex is a cough. This is typically triggered when the larynx senses that something has penetrated this upper portion of the airway. The cough, then, acts as a protective mechanism, serving to cough out or expel something at risk for being inhaled. There are normal reflexive thresholds or âtriggersâ that exist in the larynx. When these thresholds are lowered (i.e., more sensitive), less stimulation is required to trigger a cough.
1 against a cough. 2 any of a large group of opioid and nonopioid drugs that act on the central and peripheral nervous systems to suppress the cough reflex. Because the cough reflex is necessary for clearing the upper respiratory tract of obstructive secretions, antitussives should not be used with a productive cough.