Steps of Contraction
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4 Terms
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First step of contraction
Innervation/excitation by somatic motor neuron. Receives acetocoline from motor end plate of sarcomere
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Second step of contraction
Action potential has to spread down the length of the sarcolemma.
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Third step of contraction
Calcium comes out of sarcoplasmic reticulum through voltage gated channels to bind to troponin. Moves tropomyosin out of the way. Forms cross bridges
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Fourth step of contraction
ATP fuels action of pulling actin toward M line, sliding filament mechanism.
Note 
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