Fig. 1. Comparison of (A) heart rate (beats min–1), (B) cardiac
output (ml min–1), (C) ventricular pressure (kPa) and (D)
stroke volume (ml beat–1) in semi-isolated hearts of the
American lobster, Homarus americanus, before
(t0–t5), during
(t6–t7) and after
(t8–t25) the perfusion of 2.5
mmol l–1 solutions of adenosine or adenine nucleotides. The
vertical dashed lines indicate the infusion period. Data are presented as
means ± s.d. (N is given in the respective graphs). An
asterisk denotes a value significantly different from the control value
(P
0.05).