Answer
a. ACh
Work Step by Step
The neuromuscular junction is where a motor neuron meets a muscle fiber. The axon terminal of the motor neuron releases ACh into this junction; ACh will then stimulate the muscle fiber.
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.