Figure 4.

The changes in (a) hepatic arterial pressure responses (Δ HAP) and (b) portal venous pressure responses (Δ PVP) to intra-arterial injection of ATP. The adenosine receptor antagonist 8-phenyltheophylline (10 μM) significantly decreased hepatic arterial responses to ATP, while portal venous responses were unaffected (* p < 0.05, ** p < 0.01, compared with before 8-SPT). The error bars in the graphs represent the SE.