Wednesday, January 18, 2012

Function of neuron


Communication between neurons: in order o communicate the message  of nervous system, two neurons must communicate information. But the neurons do not actually meet. There is a gap between the axon terminal of one neuron and dendrite of another neuron. This is called synapse. Within the axon terminals of a neuron there are many structures called synaptic vesicles which contain chemical substances called neurotransmitters. When the axon potential reaches to axon terminals the synaptic vesicles release neurotransmitters that that travel across the tiny synaptic gap until they reach specialized receptor sites in the membrane of the other cell. Different neurotransmitters have different receptors sites so that neurotransmitter fit like key into lock. The neurotransmitters either produce excitatory or inhibitory effect depending upon the nature of neurotransmitter. After they complete their tasks neurotransmitters are either taken back for reuse in axon terminals (reuptake) or they are chemically deactivated.


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