Abstract
Experiments with fluorescent dyes showed that high concentrations of K(+) ions in the medium depolarize the membrane and enhance exo-endocytosis in nerve structures, which is accompanied by an increase in acetylcholine concentration in the somatic muscle of earthworm. In the presence of BAPTA and without Ca(2+) exo-endocytosis is sharply decelerated, the level of acetylcholine in the muscle decreases, but remains relatively high.
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