10-25-2011, 05:21 AM
A 72 year old man has a cardiac arrest and despite resuscitation efforts, dies 10 minutes later. When he is examined at the morgue, his muscles are frozen in a contracted state. The underlying physiologic reason for this is:
A. Because there is no source of ATP, the myosin head cannot detach from actin and they remain bound together
B. Because there is no source of calcium, there can be no actin myosin cycling
C. Because there is no source of ATP, the actin cannot detach from tropomyosin and the filament remains frozen in position
D. Because there is no source of ADP and Phosphorus, there is no power stroke of the myosin head to move the muscle
E. Because there is an ATP pool left in the muscle, the actin-myosin complex remains active and continually contracted