Question

when the blood glucose level starts to decrease toward lower then normal:

a. liver cells imcrease the rate at which they comvert glucogen, amino acids, and fats to glucose

b. there is an increase in glycogenolysis

c. there is an increase in gluconeofenesis

d. all of the above

Answer 1

all of the above.

when blood glucose level starts to decrease toward lower than normal, alpha cells of the pancreatic islets secrete glucagon.

Glucagon plays a major role in maintaining blood glucose levels by activation of hepatic glycogenolysis and gluconeogenesis. Glucagon and epinephrine markedly stimulate the breakdown of glycogen in muscle and liver. The liver is more stimulated by glucagon whereas muscle is more stimulated by epinephrine. The enzymatic activity of glycogen phosphorylase, principle enzyme in glycogenolysis, is regulated by these two hormones.