When the 5___ reaches the end of an axon, the neurotransmitter is released, and it diffuses to the muscle cell membrane to combine with 6 and allow the ion known at 7___ to diffuse in and stimulate an action potential to form and move along the muscle cell membrane known as the 8___.

5- action potential 6- receptors 7- calcium ions 8- sarcolemma

Explanation:

This description illustrates the pathway of a action potential traveling along a neuro-muscular junction. this functions as a chemical synapse between a motor neuron and a muscle fibre. It allow the motor neuron to transmit a signal/action potential to the muscle fiber, causing muscle contraction.

5) Nerve impulse.

6) Post synaptic receptors.

7) Depolarization.

8) Sarcolemma

Explanation:

When the "Nerve Impulse" reaches the end of an axon, the neurotransmitter is released, and it diffuses to the muscle cell membrane to combine with "Post synaptic receptors" and allow the ion known at "Depolarization" to diffuse in and stimulate an action potential to form and move along the muscle cell membrane known as the "Sarcolemma".