The muscle cells of a marathon runner's legs would exhibit all these characteristics except

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Low myoglobin content is not a typical characteristic of muscle cells in a marathon runner's legs. Marathon runners rely heavily on aerobic metabolism, which requires plenty of oxygen. Myoglobin is a protein that facilitates the transport of oxygen within muscle cells, and high myoglobin content is therefore desirable for a marathon runner. The other four characteristics listed are typical of muscle cells in marathon runners, including high resistance to fatigue, many mitochondria for ATP production, low glycogen content due to reliance on fat metabolism, and slow speed of contraction for endurance.

The Muscle Cells of a Marathon Runner's Legs Would Exhibit