d. Saddle (e.) Plane Put the steps of skeletal muscle contraction in order from 1 to 4 This triggers the binding of Ca to troponin and movement binding sites in actin.
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Sarcolemma and T-tubules depolarize, and result in calciu q Acetylcholine, released by the motor neuron, depolarizes 4 Myosin heads, now able to form cross-bridges with actin muscle.