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. 2002 May 1;540(Pt 3):951–970. doi: 10.1113/jphysiol.2001.013443

Figure 1. Acidosis-stimulated medullary raphe neurones responded to changes in pHo induced either by changes in PCO2 or in [NaHCO3]o.

Figure 1

Shown is a neurone that increased its firing rate in response to both hypercapnic acidosis and isocapnic acidosis, and decreased its firing rate in response to both hypocapnic alkalosis and isocapnic alkalosis.