Abstract
1. 1. Acetylcholine potentiates twitches in low concentrations and induces contracture in high concentrations. Acetylcholine contracture is temperature dependent. 2. 2. Tryptamine is more effective than 5-hydroxytryptamine in potentiating twitches and in inducing rhythmicity. 3. 3. High concentrations of noradrenaline, tyramine and GABA potentiate twitches. 4. 4. High concentrations of adrenaline, dopamine and glutamic acid depress twitches. 5. 5. At comparable concentrations, tryptamine is more effective than 5-hydroxytryptamine in relaxing acetylcholine contracture.
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