I need help putting these steps in order.
Ca2+ pumps restore Ca2+ to SR → relaxation!
Action potential travels down the axon in response to nerve stimulus.
Myosin binds to actin
Action potential causes Ca2+ release from SR
Myosin pulls actin chain along and Sarcomere shortens → contraction!
Action potential travels down the T Tubule and into Sarcoplasmic Reticulum (SR)
Ca2+ binds to troponin. Troponin moves tropomyosin uncovering myosin binding site on actin