However, a series of weak stimuli can combine, increasing the amount of neurotransmitter that is released. This results in enough neurotransmitter being diffused across the synaptic cleft to ...

There are two types of removal: Re-uptake – the neurotransmitter is reabsorbed back into the presynaptic neuron and restored inside a vesicle ready to be used again. For example, noradrenaline.

which is based on the type of neurotransmitter released. Excitatory synapses send signals that encourage the creation of an action potential by the next neuron; inhibitory synapses work against it.

We made no explicit assumption about the number of synapses or the rate of neurotransmitter release ... Variability in response to mixed excitatory and inhibitory input is less than in vivo.

The first four agents act by enhancing the activity of the inhibitory neurotransmitter γ-aminobutyric acid (GABA) in the CNS. Ketamine antagonizes the effect of the excitatory neurotransmitter N ...