Why does rigor mortis result in muscular rigidity after death?
A. The enzyme that hydrolyzes ATP is no longer being produced; therefore, the myosin heads will not receive the actin filament.
B. The ATP necessary to bind to the myosin head and release the cross bridge is no longer present.
C. ATP production is no longer possible; therefore, cross bridges cannot be formed.
D. A buildup of intracellular calcium keeps the troponin molecule free of the active site on actin.
Answer: B
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