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. 2009 Mar 31;212(8):1140–1152. doi: 10.1242/jeb.028621

Fig. 8.

Fig. 8.

SYWKQCAFNAVSCFamide increased the amplitude and altered the frequency of heartbeat in Homarus americanus. Heartbeat was recorded with a force transducer in control saline and during perfusion with 10–6 mol l–1 SYWKQCAFNAVSCFamide. (A) In some preparations, the frequency of heartbeat decreased, whereas the amplitude of contractions increased in the presence of SYWKQCAFNAVSCFamide. (B) In other preparations, both the frequency and the amplitude of the heartbeat increased in the presence of the peptide.