Acetylcholine binds to receptors on the motor end plate, opening sodium channels.        

______________ Calcium binds to troponin, causing tropomyosin to roll away from the active sites on actin.

______1_______ An action potential travels down the axon of a motor neuron to the synaptic terminal.               

______________ ATP binds to myosin, causing it to release actin.                 

______________ Sodium ions rush in, triggering an action potential that travels along the sarcolemma.                

______________ Voltage-gated calcium channels open, and calcium rushes into the synaptic terminal.

______________ Myosin binds with a second actin, and the cycle repeats, resulting in muscle contraction.

______________ Vesicles containing acetylcholine fuse with the plasma membrane, releasing ACh into the synaptic cleft.

______________ The myosin head splits the ATP into ADP and phosphate, putting it back into its original position.

______________ Myosin binds with actin’s active site, producing a cross-bridge.

______________ The action potential along the sarcolemma causes calcium to be released from the sarcoplasmic reticulum.

______________ The myosin head releases ADP and phosphate, causing the head to pivot towards the M line.