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A woman has a cast removed after 6 weeks. What change will you see on the muscle of the affected limb?

1. decrease fibers
2. decreased myofibrils
3. decreased ATP
4. no change


decreased myofibrils...its atrophy due to immobilization/cast


thanks asmi but what's the diff between fibers and myofibrils


The fiber is the muscle cell, while the myofibril is the bundle of actin and myosin inside the muscle cell. In the short term, you will lose myofibrils (actin and myosin), but the fibers (cells) will remain.


thanks jalabert!
this was one the things that always confused me....thanks for clearing that one! smiling face

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