Question

which of the following statements regarding glucagon is not true?
a glucagon is secreted by the alpha cells of the pancreas.
b glucagon has an effect opposite that of insulin on blood sugar level.
c glucagon is released when the body needs more sugar.
d glucagon works through the liver to lower blood glucose level.

Explanation:

• Option A: Glucagon is indeed secreted by the alpha cells of the pancreas.
• Option B: Insulin lowers blood - sugar levels, and glucagon raises them, so they have opposite effects.
• Option C: When the body needs more sugar (e.g., during fasting or exercise), glucagon is released.
• Option D: Glucagon works through the liver to increase blood glucose level (by promoting glycogenolysis and gluconeogenesis), not to lower it.

Answer:

D. Glucagon works through the liver to lower blood glucose level.