Calcium availability is increased after the sarcoplasmic reticulum receives stimulus from an action potential

Calcium [Ca++] concentration is lower in the sarcoplasmic reticulum, resulting in decreased Ca++ availability and therefore binding to troponin C

Calcium phosphate is degraded releasing calcium into the sarcoplasmic reticulum inhibiting contraction of myosin and actin

Calcium causes pH to decrease resulting in insufficient buffer availability 

Calcium is blocked from combining with tropomyosin and contractions are inhibited