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Step 1

Relaxed Muscle, thin filament

Step 2

Sarcoplasmic reticulum releases Ca2+ into the sacroplasm.

Step 3

Myosin heads bind to actin

Step 4

Myosin heads swivel toward center of sarcomere (power stroke)

Step 5

ATP binds to the myosin head and detaches if from actin

Step 6

Hydrolysis of ATP transfers energy to myosin head and reorients it.

Step 7

Contractiion continues if ATP is available and Ca2+ level in the sarcoplasm is high.

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