Rank these molecules or groups of molecules by when mammals use them as fuel, from right after a meal through only during starvation.

The question is incomplete: the complete question is:

Rank molecules or group of molecules by when mammals use as fuel, starting right after meal to only through?

starvation.

a) glucose from glucose-2-phosphate from glycogen.

b) free glucose and amino acids

c) fatty acids from triglycerides

d) glucose produced from amino acids in liver.

B

A

C

D

Explanation:

Free glucose and amino acid enters into the blood stream directly and can be used immediately after meals by mammals.

The liver stores excess glucose as glycogen, hence when glucose levels begin to reduce in the body, the pancreas releases glucagon which converts glycogen to glucose.

Triglycerides are broken down to give fatty acids which gives much more energy than glucose.

During starvation, amino acids in the liver is converted to glucose when a person goes for days without eating.

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