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ExamsNEETBiology

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

A motor neuron stimulates a muscle fiber at the neuromuscular junction, where the neuron’s axon terminal releases neurotransmitter onto the muscle membrane. This starts the muscle action potential that then spreads into the fiber.

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