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The following question is offered in anticipation of our chapters on metabolism: Assuming that the average weight of an adult is 160 lbs, how many molecules arrive each second at a mitochondrion of an average active person? Assume that oxygen consumption is 45 mL per minute per kilogram of body weight, adults have about 1E12 cells, and there are 800 mitochondria per cell. Report your answer to seven figures.

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