Experiments were carried out to determine the advantage in using isolated rat jejunum in the assay of acetylcholine (ACh) in preference to other tissues. Rat jejunum was found to be sensitive to ACh 0.01 micrograms, 5-hydroxytryptamine (5HT) 0.2 to 0.5 microgram and least sensitive to histamine. (Ach greater than 5HT greater than histamine).
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