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Inward movement of sodium ions in resting and stimulated frog's sartorius muscle

1. Paired frog sartorius muscles were exposed to Ringer solutions labelled with 22Na+ for about 20 min. At the end of this exposure one of them was stimulated supramaximally one hundred to two hundred times. Immediately after the stimulation both members of the pair were washed in a series of tubes filled with a Na+‐free medium containing 3 × 10−5 M strophanthidin.