The apneic laryngeal chemoreflex (QRL), elicited by water on the vocal cords and the reflex by mechanical stimulation (MRL) has been compared in dog.
The response decrease with naloxone at a 400 micrograms.kg-1, suggesting that the reflex inhibition depends on endogenous opioids of the respiratory centre.
CITATION Rev Med Univ Navarra. 1987 Apr-Jun;31(2):71-3
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