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THe brain sends a nerve impulse through the neuromuscular junction. When that is sent, the impulse causes calcium ion voltage gates open and allow for the calcium to enter the neuron. This allows for a stimulation of the acetylcholine (Ach) , or the neurotransmitter.THen the ach binds to the recptor which opens up voltage-gated Na+ ion channels which causes Na to flow through the muscle cell which causes it to become depolarized. The depolarization causes voltage gated k channels to open and send the action potential down the sarcolemma. This allows for the k pumps to be initiated and help make the cell become repolarized.

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Step 3: Bridge deattaches by ATP attaching to the head

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Step 4: Hydrolysis of ATP causes the myosin head to "cock" into a high energy state

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step 2: Myosin head pivots and pulls actin towards M line

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step 1: Myosin head attached to actin which forms a bridge.

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Step 3 and 4: Ca combines with troponin which causes the tropomyosin to be blocked through the changing of the shape of the Myosin. Finally the myosin creates a bridge that leads towards contraction.

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Step 2: The action potential's movement down the t tubes causes Calcium to be released which then flows towards to Cyol

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Step 1:  The action potential  moves down the sarcolemma and down the T tubes.