A 15-Year-Old Boy Is Brought to Your Office Due to Concerning

A 15-Year-old boy is brought to your office due to concerning muscles weakness. He Has no prior medical disease and take no medication. He states that he has difficulty climbing stairs. and he cannot left his upper extrimities above his head. On examination, he is unable to lift his arms or legs against resistance when fully outstretched. Muscle biopsy is done and shows sparse transverse tubules in some of the muscle fibers. Which of the following is the most likely consequence of this patient's biopsy findings?

A) Decremental force generation on repeated muscle stimulation
B) Impaired ATP production during active muscle contraction
C) Impaired relaxation after sustained muscle contraction
D) No contraction of the myocyte in response to increased intracellular Ca
E) Uncoordinated contraction of myofibrils within affected muscle fibers

Correct Answer:

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