What will be the likely cause of death in a 4-year-old boy who tires easily, exhibits weakness in the pelvic and shoulder girdles, and calf muscle enlargement, with elevated serum creatine kinase levels, and a biopsy showing marked variation in muscle fiber size and shape, muscle fiber necrosis, myophagocytosis, regenerating fibers, and fibrosis?
ARespiratory failure/complications
BCerebrovascular complications
CChronic kidney disease
DPulmonary embolism
What covers the binding sites for myosin heads on actin in skeletal muscles?
ATropomyosin
BTroponin
CCalcium
DNone of the above
An electron microscopy of muscle biopsy shows 'parking lot' appearance. Which additional finding would confirm myotonic dystrophy?
ARagged red fibers
BRing fibers
CCentral cores
DNemaline rods
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