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Fig. 1. (A) Summary diagram of the standard model of metabolic regulation; in this
conceptualization, accelerating tissue ATP utilization leads to increasing
concentrations of ADP and Pi, which serve as substrates for
oxidative phosphorylation, to activate ATP production. (B) Summary of an
alternative model of metabolic regulation in which ATP demand and ATP supply
pathways are simultaneously activated during large-scale change in tissue work
rates. See text for further details.
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