Describe what is happening overall in the first sentence. Then describe, in detail, what is happening in each step below. Include details about what is happening at steps 5 - 7 in terms of calcium and the contraction mechanism (from a different figure). (a) -Axon terminal of somatic motor neuron Muscle fiber ACh- potential Action Na+ Action potential- -Motor end plate- lell Ca2+ released Myosin thick filament 6 + + + ++

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