Neurotransmitters are biological molecules that are secreted by neurons and that alter the behaviour of their target neurons or effector cells. Release of hunger-promoting and satiety-promoting ...

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.