What causes calcium to be released from the sarcoplasmic reticulum?
A) Calcium is released when acetylcholine binds acetylcholine receptors.
B) Calcium is released when an action potential travels down the motor neuron.
C) Calcium is released when an action potential reaches the triad.
D) Calcium is released when an action potential is generated at the neuromuscular junction.
E) Calcium is released when myosin heads bind to actin.
Answer: C
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