In addition to the energy available in the ATP molecule, _________ provides an immediate source of high-energy bonds available to power muscle contraction
a. fat
b. glycogen
c. glucose
d. lactic acid
e. creatine phosphate
E; Creatine phosphate has a phosphate attached to the creatine via a high-energy bond. This constitutes the most direct energy reserve in the muscle. Glycogen and glucose must be metabolized by glycolysis to provide ATP and then by aerobic respiration in order to extract the maximum amount of energy from them. Fat must be broken down and then respired. Lactic acid must be converted back to pyruvate and then respired.
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