The CNS consists of the brain and spinal cord whereas the PNS includes neurons that branch off from ... Researchers have identified more than 100 types of neurotransmitters—the most common include ...

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.