The energy sources for muscle contraction, in the order in which they are used, are:
A)glycogen, ATP, creatine phosphate
B)ATP, creatine phosphate, glycogen
C)creatine phosphate, ATP, glycogen
D)ATP, glycogen, creatine phosphate

Question

Quizplus · Accepted Answer

ATP is used first, followed by creatine phosphate, and then glycogen. This is because ATP is the immediate source of energy for muscle contraction, but its stores in the muscle are very limited. Creatine phosphate can quickly replenish ATP levels, but its stores are also limited. Therefore, glycogen is used as a longer-lasting energy source when ATP and creatine phosphate stores are depleted.

The Energy Sources for Muscle Contraction, in the Order in Which