Abstract
Conclusions
1. When tracheal air flow is so impeded as to produce pronounced changes in inspiratory and expiratory pressures, breathing rates increase, minute volumes may remain relatively uniform and tidal volumes decrease inversely with the pressure differences. 2. Two factors are involved in the accommodation to this respiratory stress: (a) Increasing carbon dioxide tensions act as primary stimuli to more forced inspiration and expiration; (b) Decreasing oxygen tensions act as stimuli to more rapid breathing by reducing the time of the expiratory phase of the breathing cycle.
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