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Figure 6


Fig. 6. Excitatory effects of biogenic amines on the isolated cardiac ganglion (CG). (A) Extracellular recordings from the trunk during control and in the presence of the 10–6 mol l–1 serotonin (5HT). (B) Serotonin significantly increased the burst frequency, duty cycle, number of spikes per burst and spike frequency in the burst (Student's t-test; N=7; *P<0.05; **P<0.01). (C) Extracellular recordings from the trunk during control and in the presence of the 10–5 mol l–1 dopamine (DA). (D) Dopamine also significantly increased the burst frequency, duty cycle, number of spikes per burst and spike frequency in the burst (Student's t-test; N=9; *P<0.05; **P<0.01).





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