Describe how glycolysis, creatine, and mitochondria are important to a skeletal muscle fiber's ability to obtain energy for contraction
What will be an ideal response?
Working skeletal muscles obtain ATP for contraction from three main sources. Glycolysis is a series of reactions occurring in the cytoplasm and it represents the early stages of glucose breakdown. Only a small amount of ATP is formed in glycolysis, but the final product (pyruvate) can be used in aerobic respiration to release more energy. In aerobic respiration, the mitochondria use oxygen in the process of liberating more energy from food compounds than is possible in glycolysis alone. After ATP is made, some of the excess ATPs can temporarily donate one of their phosphates (Pi) to a compound called creatine to make creatine phosphate (CP). When needed, the CP can quickly donate the Pi back to ADP to make ATP, but this provides ATP for only a few seconds of maximum exertion.
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