The photo of muscle biopsy being illustrated here is an ATPase preparation performed at pH 9.4. The features includes:

1. Type I fibers are smaller then type II fibers.

2. Can be seen in demyelinating polyneuropathy.

3. Can be seen in congenital fiber type disproportion.

4. These changes are typical in disuse atrophy.

A. I, 2, and 3 are true.

B. Only 1 and 3 are true.

C. Only 2 and 4 are true.

D. Only 4 is true.

E. None of the above.

Answer and Discussion

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