FLUCTUATIONS OF ARTERIAL pH ASSOCIATED WITH THE RESPIRATORY CYCLE IN DOGS

Abstract
Using the glass electrode assembly connected with the femoral artery in dogs, the cyclic fluctuation of pH of the circulating arterial blood was observed under varying rates and depths of respiration. The frequency of fluctuation coincided with the respiratory rate, and the size of fluctuation was magnified as respiratory frequency was decreased. When CO2 inhalation induced the increase in depth of the breathing without changing the frequency, a smaller range of cpH fluctuation was resulted.