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Stimulation of a muscle fiber by a motor neuron occurs at:

1. the neuromuscular junction
2. the transverse tubules
3. the myofibril
4. the sarcoplasmic reticulum

Correct answer: the neuromuscular junction

Solution

Stimulation of a muscle fiber by a motor neuron occurs at the neuromuscular junction, where the motor neuron releases neurotransmitters that bind to receptors on the muscle fiber.

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