An electrophysiological investigation of the slow fibre system in the frog rectus abdominis muscle

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Abstract
1. Junctional potentials were recorded with a micro-electrode inserted into muscle fibres of the rectus abdominis muscle of the frog. Large and small nerve fibres were stimulated separately, using a selective stimulation technique. In a few muscle fibres rectangular current pulses were applied through a second micro-electrode to examine current—voltage relations.