Xavier and Jill are practicing the 100-meter sprint. Which statement BEST describes the metabolic pathways their muscles will utilize to produce the quick energy needed for this intense exercise?
A Glucose is converted to pyruvic acid, followed by the aerobic pathways of the Krebs cycle and the electron transport chain.
B. Glycolysis produces pyruvic acid and 2 molecules of ATP, then in the absence of oxygen, alcoholic fermentation regenerates NAD to keep
glycolysis running
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C. The pyruvic acid from glycolysis enters the mitochondria and is broken down in the Krebs cycle.
D. Glycolysis begins glucose metabolism, and in the absence of oxygen, lactic acid fermentation takes over.