The principal store of metabolic energy available during long term fasting or starvation is
A) muscle glycogen.
B) liver glycogen.
C) muscle protein.
D) adipose tissue triacylglycerol.

Question

Quizplus · Accepted Answer

Adipose tissue triacylglycerol is the primary source of metabolic energy during long term fasting or starvation. As the body runs out of glucose and glycogen stores, it turns to fat stores for energy. Adipose tissue is broken down into fatty acids, which are transported to the liver and converted into ketone bodies to be used as an alternative fuel source for the brain and other organs. Muscle glycogen and liver glycogen are used up relatively quickly during fasting, and muscle protein is only used as an energy source as a last resort and can result in muscle wasting.

The Principal Store of Metabolic Energy Available During Long Term