During early fasting, glycogen is used as a source of glucose for the blood. After liver glycogen is depleted which of the following occurs?
A) amino acids of muscle proteins are used to synthesize glucose in the liver
B) blood glucose falls below 5mM until carbohydrate is eaten
C) fatty acids of adipose tissue are converted into glucose in the liver
D) liver fatty acids are degraded as precursors for blood glucose
E) muscle glycogen is used as a source of glucose for the blood

Question

Quizplus · Accepted Answer

After liver glycogen is depleted, the body begins gluconeogenesis, where amino acids from muscle proteins are used to synthesize glucose in the liver to maintain blood glucose levels.  During periods of fasting and starvation, when liver glycogen levels are depleted, the major source of carbon atom for hepatic gluconeogenesis is from the amino acids released due to protein degradation within skeletal muscle.

During Early Fasting, Glycogen Is Used as a Source of Glucose