Fig. 5.

Vasomotor responses of trout coronary arterioles to increasing concentrations of endothelin-1 (ET-1) (A) and sodium nitroprusside (SNP) (B) at three acclimation temperatures (1°C, 5°C, and 10°C). Dissimilar lower-case letters indicate significant differences in the response of vessels to the various concentrations of ET-1 or SNP, at a given acclimation temperature. Dissimilar capital letters indicate significant differences in the response of vessels at different acclimation temperatures to the same concentration of ET-1 or SNP. To improve clarity of the figure, capital letters are not included when differences were not significant (i.e., AAA). P < 0.05, except where indicated (*), where 0.1 > P ≥ 0.05. Note: a series of sham saline injections did not result in noticeable (i.e., <0.6%) changes in vessel ID. Thus we considered any change in vessel ID greater than the mean change + 2 SD caused by the sham saline injections (∼3%) to be biologically significant.