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Word Count: 485
neurotransmitters play a central and critical role in our psychological existence identity and experience of the worldNeurotransmitters are chemicals that communicate between nerves In some ways neurons are like computers they receive messages process those messages and send out the results as new messages to other cells In the case of neurons messages consist of chemicals that interact with the outer surface of the cell membrane This chemical interaction with the cell membrane causes chemical changes within the receiving neuron The process in which when chemical massages are constantly being exchanged between neurons is called neurotransmission Neurotransmission can also be defined as the process in which neurotransmitters travel between neuronsA resting neuron has a negative charge Therefore there are more negative ions inside the axon than outside the axon However the fluid outside the axon has a positive charge Due to the different charges of the outside and inside of the axon the axon is polarized When a neuron is fired several events take place to create an electrical impulse called an action potential Sodium ions which have a positive charge Na enter the axon This process depolarizes the axon which changes the electrical charge inside the axon from negative to positive In response to this action potential the vesicles group at the edge of the axon and release neurotransmitters into the synapse After the neurotransmitters are released potassium ions K flow out of the axon Since potassium ions have a positive charge their absence restores the negative charge inside the axon The neuron is again polarized and at rest waiting to fire another action potentialWhen the neurotransmitters have been released they float across the synapse until they attach to the dendrites of the next neuron On each dendrite neurotransmitters find molecules that are set to receive them These molecules are called receptors Neurotransmitters recognize specific receptors and hook onto them This process is called binding The neuron that originally released the neurotransmitter is the
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