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Review Question - QID 109218

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QID 109218 (Type "109218" in App Search)
A 21-year-old male comes to the physician’s office with complaints of fatigue. The patient is a college intramural athlete and has noticed that during hard workouts with his team, he gets severe muscle pain and weakness to the point where he has to stop and rest. Usually he is able to recover and the cramps subside after rest. After strenuous workouts he has also noticed that his urine is dark. On exam, the patient has no acute symptoms and appears to be sitting comfortably with a completely normal exam. The patient does not have any tenderness to palpation of his muscles. Which of the following enzymes is most likely defective in this patient?