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Fig. 3. Representative original recordings of dorsal aortic blood pressure (Pda) from one trout before treatment (A) and after prazosin (1 mg kg–1) treatment (B). 30 s of pre-branchial occlusion starts at a and stops at b followed by a mean circulatory filling pressure manoeuvre between c and d. White bars represent 10 s mean values + S.E.M. of Pda prior to occlusion and black bars represent 10 s mean values + S.E.M. of Pda immediately following the mean circulatory filling pressure manoeuvre. *Statistically significant difference (Px0.05) between values. Note the reflex increase in pressure during occlusion and the following increase in pressure in the untreated fish. After prazosin treatment this reflex response is absent.





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