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Fig. 2. Electrocardiograms (ECGs) and pressures in the alligator pulmonary circuit. Top traces, ECGs recorded from the middle of the right ventricle (RV ECG, red) and the cog-wheel valve muscle (cog-wheel ECG, blue). Bottom traces, right ventricular pressure (RV, red) and pulmonary arterial pressure (PA, green). A and C show results from animals with a functioning cog-wheel valve. B and D show results from the same animals, but after the cog-wheel valve had been inactivated by application of acetylcholine.