Abstract

1. AMP, adenosine, inosine and hypoxanthine were present in perfusates collected from bovine adrenal glands during periods when catecholamine secretion was evoked by injections of carbamoylcholine. 2. The molar ratio of catecholamines to ATP-catabolites present in the perfusates was similar to that of catecholamines to ATP in chromaffin granules. 3. ATP added to the perfusing medium was extensively degraded during passage through bovine adrenal glands. 4. The mechanism of catecholamine secretion is discussed.

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