Abstract
The role of pancreatic hormones as regulators of blood glucose levels in Ambystoma annulatum was investigated. Average fasting blood glucose was 52.6 mg%, with a range from 30 to 90 mg%. Single injection of 10 microunits of insulin resulted in a significant drop in blood glucose. This decline was detected as early as three hours after injection. At 12 hr a minimum mean level of 8.5 mg% was recorded. Control levels were reestablished by 72 hr. Single injections of 10 micrograms of glucagon caused an immediate (0.5 hr) rise in blood glucose. The maximum mean value (147.5 mg%) was recorded at 5 hr. By 36 hr control levels were re-established. Blood glucose levels for nine other salamander species were determined.
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