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Fig. 2. Summary of hypoxia-elicited cardiorespiratory reflexes. Effects on ventilation rate (A), ventilation amplitude (B), ventral aortic pressure (C) and heart rate (D) in control fish (filled circles) and in MK801 treated fish (open circles). (E) Changes in partial oxygen tension (PO2) in the respiratory water during hypoxia. Values shown are means + S.E.M. (N=7). *A statistically significantly difference (P<0.05) from resting values; {dagger}statistically significant difference (P<0.05) between control and MK801 treated fish. For abbreviations, see Table 3.