Discussion
Arrange the following sources of energy for muscular exercise in order of their sequence of availability :
I. Triglyceride
II. Glycogen
III. A.T.P.
IV. Phosphocreatine
Codes :
Answer: D
Energy sources for muscular exercise become available in the order ATP (III), phosphocreatine (IV), glycogen (II) and triglyceride (I). ATP stored in the muscle is used at once, phosphocreatine rebuilds it within seconds, glycogen follows through glycolysis, and fat supplies energy for long, slow work.
The other sequences put glycogen or fat before the immediate stores, which reverses the speed at which they can be used. In a 100 m sprint ATP and phosphocreatine supply nearly all the energy, and in a marathon fat is the main fuel, which shows the sequence.
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