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Pressure electrode recording of mechanical (upper) and electrical activity (lower traces) from a segment of cat small intestinal muscle in normal Krebs saline (a), after 7 minutes in calcium-free solution (b), and after 50 minutes in calcium-free solution (c). Following 50-minutes incubation in calcium-free solution, prolonged potentials (trace C) and corresponding contractions were observed. Calibration bar: A/B 0.4 mV, 0.8 g, 16 sec; C 0.27 mV, 0.13 g, 10 sec. From [9].
