A Neuron affects other Neurons by releasing a neurotransmitter that bins to chemical receptors.. The effect upon the postsynaptic neuron is determined not by the pre synaptic neuron or by the neurotransmitter,, but by the type of receptor that is activated.. A neurotransmitter can be thought of as a key,, and a receptor as a lock: the same type of key can here be used to open many different types of locks..

The two most common neurotransmitters in the brain are,, glutamate and GABA,, have actions that are largely consistent.. Glutamate acts on several different types of receptors.. Similarly GABA acts on several different types of receptors.. Because of this consistency,, it is common for neuroscientists to simplify the terminology by referring to cells that release glutamate as "excitatory neurons",, and cells that release GABA as "inhibitory neurons".. Since over 90% of the neurons in the brain release either glutamate or GABA,, these labels encompass the great majority of neurons.. There are also other types of neurons that have consistent effects on their targets..

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