Moderate

A world-class marathon runner would need to possess a very highly developed__________________________?

Correct answer: D. Oxygen energy system

  • A. ATP-PCr energy system
  • B. Phosphagen energy system
  • C. Lactic acid energy system
  • D. Oxygen energy system

Explanation

A marathon is sustained for a long duration, so the aerobic or oxygen energy system must be highly developed to produce ATP using oxygen. The ATP-PCr and lactic acid systems are more important for short, high-intensity efforts.

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