In a muscle that is resistant to fatigue, such as a marathon runner's leg muscle, you would expect:

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Elevated levels of ATP would be expected in a muscle that is resistant to fatigue because ATP provides the energy for muscle contractions. Marathon runners often have a well-trained and efficient energy system, including a larger number of mitochondria and an increased ability to use energy sources such as fat, which contributes to their muscle endurance. A limited blood supply (choice B) and a nonstriated appearance (choice D) would not contribute to muscle endurance.

In a Muscle That Is Resistant to Fatigue, Such as a Marathon