steps of a muscle contraction 1-6
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step 4
Myosin heads bind to actin binding site making a cross bridge
step 5
Myosin heads do a powerstroke (using ADP and P) which slides actin and decreases length of sarcomere (Z line to Z line)
step 3
Troponin changes shape and exposes actin binding site
step 2
Calcium binds to troponin
step 1
Calcium ions rush into muscle fibers
step 6
ATP causes release of myosin head from actin binding site (cross the myosin head is free to repeat the cycle as long as calcium is in and the ATP available)