1. When a nerve impulse reaches the end of an axon, substances called neurotransmitters are released (e.g., acetylcholine).

2. Neurotransmitters pass between the axon and the dendrites of the following neuron at the axon-dendrite junction. A synapse is the name for this juncture.

3. Neurotransmitters bind to the dendrites' membranes, allowing the nerve impulse to pass through to the receiving neuron and reach the target site. (muscle cells)