neurotransmitters

• are chemical messengers that pass signals from the presynaptic neuron to the postsynaptic neuron across the synapse.
• neurotransmitters carry electrical signals which they change into chemical signals in order to cross the synapse.
• once it has reached the postsynaptic neuron, the neurotransmitter is absorbed; the result of which changes the chemical signal back into an electrical one
• EXAMPLE

  Mental health can be impacted by neurotransmitters, such as serotonin, which affects mood, hunger, and sleep. A lack of serotonin is found in individuals suffering from depression. The purpose of many anti-depressant drugs is to increase serotonin levels.