Multiple choice

Which of the following statements regarding action potential across the muscle fibre is correct?

  1. The action potential propagates by activating voltage gated potassium channels along the axons of the neuron.

  2. An action potential originates in the PNS.

  3. The Na+ influx leads to a vesicle containing the neurotransmitter acetylcholine to fuse with the plasma membrane.

  4. The action potential propagates by muscle fibre's plexus of T-tubules.
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D Correct answer
Explanation

The above statement is true. The action potential propagates by muscle fibre's plexus of T-tubules, depolarizing the inner portion of the muscle fibre.

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