1 Motor Neurons A motor neuron ... stored and released from neurons via synaptic vesicles in response to action potentials and voltage-gated calcium channels. Once they traverse the gap between ...

Between impulses the transmitter molecules are rapidly removed from the synaptic cleft to prevent continuous ... reabsorbed back into the presynaptic neuron and restored inside a vesicle ready ...

This results in enough neurotransmitter being diffused across the synaptic cleft to trigger the impulse in the postsynaptic neuron. This process is called summation.