During gym class, Raul walks briskly for a half hour. Jenna decides to sprint and run the bleachers for the same amount of time. Which statement best compares the cellular processes occurring in each student during this time?

Sprinting and running bleachers are more intense than brisk walking, so Jenna’s muscles need energy faster. When oxygen supply cannot keep up with that demand, muscle cells rely more on anaerobic respiration, which produces lactic acid. Raul’s brisk walk is more likely to be fueled mainly by aerobic respiration, so Jenna’s cells produce more lactic acid.

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