Abstract
1. 1. Bullfrogs were dived for 30 min in water with O 2 saturations of 20% and 5%. 2. 2. Ventricular blood-O 2-tension was significantly higher in the group submerged in 50% saturated water. 3. 3. No significant change in ventricular blood-CO 2-tension or pH was demonstrated. 4. 4. No significant change in development, depth or release of bradycardia was demonstrated in the two groups. 5. 5. It was concluded that elevation of blood-O 2-tension in this study did not affect diving bradycardia. 6. 6. Relatively constant CO 2 and pH was attributed to anerobiasis and blood-buffering-capacity.
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