In studies of dogs running on treadmills,results stemming from a gradual increase in the slope of the treadmills supported the hypothesis that the partial pressure of CO₂ is the feedback signal controlling respiratory rate.However,a related experiment that did not support that hypothesis

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The experiment mentioned in the question did not support the hypothesis that the partial pressure of CO₂ is the feedback signal controlling respiratory rate. The reason given for this was that in a related experiment, a gradual increase in the slope of the treadmills did support the hypothesis. Therefore, we can infer that the related experiment involved a gradual increase in the slope of the treadmills. Option C mentions changing the speed at which the dogs ran instead of the slope of the treadmills, which is not consistent with the related experiment mentioned in the question. Options A, B, and D are unrelated to the hypothesis and the experiments mentioned in the question. Option E involves injecting dissolved O₂ into the dogs' arteries, which is not mentioned in the question. Therefore, the best choice is C.

In Studies of Dogs Running on Treadmills,results Stemming from a Gradual