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Identify body system B (do not include “system” in answer). 

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Identify 4.  

Identify 5, be specific.   

Place the following events of excitation in the correct order. 1) ion channels on the sarcolemma open and sodium ions enter the muscle fiber 2) the entry of sodium ions into the muscle fiber depolarizes the sarcolemma locally 3) acetylcholine is released from vesicles in the motor neuron into the synaptic cleft 4) an action potential arrives at the axon terminal of a motor neuron 5) acetylcholine binds to ligand-gated sodium ion channels in the motor end plate

Identify C.    

Identify body system F (do not include “system” in answer).    

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Identify the entire structure shown.  

Name muscle “R”.