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Figure 1


Fig. 1. Force-frequency relationships and resting tension after treatment with different drugs (see key) in ventricular (A–D) and atrial (E–H) muscle from each species. (A,E) Turtle, Trachemys scripta (N=7); (B,F) python, Python regius (N=7); (C,G) tegu lizard, Tupinambis merianae (N=6); (D,H) varanid lizard, Varanus exanthematicus (N=8). The resting tension data is for untreated tissue only. Horizontal hatched grey bars indicate the species range of in vivo heart rate for each species. The last point on each curve displays an x-error, as the N-value is less than that stated above. Values are mean ± s.e.m. *Twitch force is significantly reduced following pre-treatment with ryanodine, {dagger}twitch force is significantly increased following treatment with adrenaline, and {ddagger}the frequency at which resting tension significantly increased (P<0.05).





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