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step 2: Working (Power) Stroke: myosin head pivots and pulls actin filaments toward M-line

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Step 3: Cross Bridge Detachment: ATP attaches to myosin head, causing cross bridge to detach

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Step 4: Cocking of myosin head:energy from hydrolysis of ATP "cocks" myosin heads into high-energy state.

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step 1: Cross Bridge Formation: high-energy myosin heads attaches to actin myofilaments forming a cross bridge

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Step 3 and 4: Ca2+ combines with troponin and removes the blocking action of tropomyosin by changing the shape of the actin so that the myosin binding sites are exposed.
Myosin binds to actin forms cross bridges and contractions begin.

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Step 2: Transmission of the action potential along the T-tubules cause the adjacent sarcoplasmic reticulum (SR) to release Ca2+ which flows into the cytosol

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Step 1:  Th Action Potential from Event 1 moves down the sarcolemma and down the T-tubules.

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Event 1 of 3 consist of the Neuromuscular Junction releasing an action potential thus causing gated calcium ions to enter the neuron. This causes an increase in acetylcholine that is released in the cleft. Depolarization spreads opening voltage gated sodium channels initiating an action potential that moves along sarcolemma. Na+ concentrations stimulate a change in membrane permeability by opening voltage gated k+pumps which diffuse K+ and causes repolarization