PHYSIOLOGY
MUSCLE ENERGETICS ATP AND CP
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Which of the following correctly outlines a change that would occur at the commencement of exercise?
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Decreased Lactic Acid
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Increased Inorganic Phosphates (Pi)
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Increased PC stores
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None of the above
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Explanation:
Detailed explanation-1: -Glycolysis converts glucose to pyruvate, water and NADH, producing two molecules of ATP. Excess pyruvate is converted to lactic acid which causes muscle fatigue.
Detailed explanation-2: -When the muscle starts to contract and needs energy, creatine phosphate transfers its phosphate back to ADP to form ATP and creatine. This reaction is catalyzed by the enzyme creatine kinase and occurs very quickly; thus, creatine phosphate-derived ATP powers the first few seconds of muscle contraction.
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