Abstract
Intravenous injection of 1.0 mg glucagon brings about a marked increase in the serum concentration of insulin in normal subjects. This increase sets in before the increase in blood sugar and reaches a peak 2[long dash]8 min. after the injection. Intravenous injection of 75 units secretin also results in a rapid increase in the serum concentration of insulin in normal subjects. This increase is less marked than that following glucagon and reaches its peak 3[long dash]4 min. after the injection. Glucagon and secretin contribute to the pronounced increase in insulin concentration during oral administration of glucose.

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