James made a New Years resolution to get healthy so started an exercise plan. Early in the process he noticed that he fatigued quickly. As he continued to exercise regularly, he noticed that it took longer to fatigue. What change explains the increased endurance?

What will be an ideal response?


As James continued to exercise, his body became more used to the demands being placed upon it and increased the
number of mitochondria. The increase in mitochondria make it possible to more efficiently use oxygen to make
ATP which increases his endurance.

Anatomy & Physiology

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