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Fig. 1. (A) Diagram of the human respiratory–locomotory system showing the three stages governing O2 uptake at the lungs (3), O2 delivery by the cardiovascular system (2) and O2 diffusion through the muscle and consumption by the mitochondria (1). (B) Plot of rate of O2 uptake (O2) as a function of leg power output from rest to the aerobic capacity (O2max) in an exercising human. CK, creatine kinase.





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