Question

which is a function of glucagon?
o a. the breakdown of glycogen from the liver
o b. the uptake of glucose from the blood into cells
o c. the storage of glycogen in the liver and muscles
o d. the conversion of excess glucose into fat for storage

Explanation:

Glucagon is a hormone secreted by the pancreas. When blood glucose levels are low, glucagon is released. It acts on the liver and stimulates glycogenolysis, which is the breakdown of glycogen (stored form of glucose in the liver) into glucose. This glucose is then released into the bloodstream to increase blood - glucose levels.

• Option b: The uptake of glucose from the blood into cells is mainly mediated by insulin, not glucagon. Insulin promotes glucose uptake by cells (such as muscle and adipose cells) to lower blood - glucose levels.
• Option c: The storage of glycogen in the liver and muscles is also related to insulin. Insulin promotes glycogenesis (the formation of glycogen from glucose) in the liver and muscles.
• Option d: The conversion of excess glucose into fat for storage (lipogenesis) is also an insulin - mediated process. Insulin helps in the storage of excess nutrients, including the conversion of glucose to fat.

Answer:

a. The breakdown of glycogen from the liver