The one principal effect not attributed to the hormone insulin is:
A. glycogen formation and storage
B. conversion of glycogen into glucose
C. carbohydrate oxidation
D. inhibition of gluconeogenesis
Choose A, B, C or D as your solution.
The correct answer is $\mathrm{B}$. The pancreas is the source for two hormones: insulin and glucagon. Among its principal effects, insulin stimulates glycogen formation and storage, stimulates carbohydrate oxidation, and inhibits gluconeogenesis. All of these effects are described in choices A, C, and D. The other hormone, glucagon, stimulates conversion of glycogen into glucose. So choice B is the correct answer.