Fig. 4. Effects of
L-N5-N-iminoethyl-L-ornithine
(L-NIO; 10–5 mol l–1),
1H-[1,2,4]oxadiazole-[4,3-a]quinoxalin-1-one (ODQ; 10–5 mol
l–1) and 8-bromo-guanosine 3'5'-cyclic
monophosphate (8Br-cGMP; 10–5 mol l–1) on
stroke volume (VS) and stroke work
(WS) in isolated and perfused icefish hearts. Percentage
changes were evaluated as means ± S.E.M. of four experiments
for each group. Asterisks indicate values significantly different from the
control value: *P<0.05;
**P<0.025).