Summary
Frogs were encountered, the stomachs and hearts of which were refractory to the action of acetylcholine, even after eserine. In the hearts, the beats were augmented by acetylcholine, but diminished by vagus stimulation. They could be tetanised, and the responses with electrical stimulation were graded. The aurides and ventricles beat rhythmically but independently in the absence of electrolytes.
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-- Unpublished results.
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Singh, I., Sehra, K.B. & Singh, S.I. Reversal of the effect of acetylcholine on the frog heart with normal vagus action; tetanisation of the frog heart; Graded responses in the frog heart; the effect of electrolyte free-medium. Proc. Indian Acad. Sci. 21, 259–265 (1945). https://doi.org/10.1007/BF03049872
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DOI: https://doi.org/10.1007/BF03049872