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. 2023 Jun 7;6:100100. doi: 10.1016/j.crphys.2023.100100

Fig. 4.

Fig. 4

Effects of ACh and atropine on T4-treated tadpole- and 2–4 weeks frog-hearts. This experiment was carried out using four hearts. Values given represent the mean value ± standard error. Atropine treatments were carried out at 2 min (10−8 M atropine) and 4 min (10−5 M atropine) after ACh treatment. Each value was measured by number of heartbeats times per minute, and represented by ratio given to the control value. Experiment was carried out using 4 hearts. *Significantly less (P < 0.05) than the corresponding value for the rate for the frog heartbeats.