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Fig. 1. Effects of extracellular pH (pHo) on tension of unstimulated
efferent branchial arteries (EBA; N=11) and anterior cardinal veins
(ACV; N=11) in Hepes buffer, and on vascular resistance of rainbow
trout gills (11 gills from four trout) perfused with phosphate-buffered
saline. Values are means ± s.e.m. EBA and ACV values are significantly
different from their respective control (pH 7.8) except at pH 7.4; all
vascular resistances except at pH 7.4 and 7.0 are significantly different from
that at pH 7.8.