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- W2290820791 endingPage "R944" @default.
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- W2290820791 abstract "Application of cholinergic agents on the ventrolateral surface of the medulla in areas in which the central chemoreceptors are believed to be located stimulates breathing. It is also known that cranial nerves, such as the hypoglossal, have respiratory modulated activity (greater in inspiration than expiration) that responds to many of the same stimuli which affect breathing. In the present study we compared effects of cholinergic agents (acetylcholine, carbachol, methacholine, eserine) directly applied to chemoreceptive areas on the ventral medullary surface on phrenic and hypoglossal nerve activity. Studies were performed in paralyzed, anesthetized, and artificially ventilated cats after vagotomy. All cholinergic agents increased hypoglossal activity significantly more than phrenic activity in animals ventilated with O2 or 7% CO2 in O2 whether or not the carotid sinus nerves were intact. Atropine applied topically to the same medullary area blocked the respiratory effects of locally administered acetylcholine. The results suggest that cholinergic agents applied centrally can increase both phrenic and hypoglossal activity. Moreover the effects of the drugs are relatively greater on XII nerve activity than on phrenic discharge, suggesting that the drive from medullary cholinergic structures is distributed with unequal weight to different respiratory motoneurons." @default.
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- W2290820791 date "1984-12-01" @default.
- W2290820791 modified "2023-09-26" @default.
- W2290820791 title "Hypoglossal and phrenic responses to cholinergic agents applied to ventral medullary surface" @default.
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- W2290820791 doi "https://doi.org/10.1152/ajpregu.1984.247.6.r939" @default.
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