1Lecture 4:Neurons & NeurotransmittersHow does the nervous system work?Neurons!!Activity cells of the nervous systemSpecialized for communicationGlial cells90% of nervous system cells by numberSupport neuron functioningTypes of NeuronsSensory neuronsMotor neuronsInterneuronsEverything else in betweenMost neurons in the central nervous systemSpecialized Functions of NeuronsReceive information from neighboring neuronsIntegrate this incoming informationTransmit signals to other neurons
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2How do neurons send signals?Electrical impulsesAction potentials (neuronal firing)Withina single neuronChemical signalsNeurotransmittersBetweenseparate neuronsBasic Structure of a Neuronreceive infoInfo in from previous neuronaction potentialrelease chemicalsInfo out to next neuronintegrates infoIncoming SignalsChemical signal received by dendritesExcitatory“Yes, send this message!”Increase likelihood of action potentialInhibitory“Stop this message!”Decrease likelihood of action potentialCell body adds signals togetherEnough excitation Action PotentialBasic Structure of a Neuronreceive infoSummation of all received info occurs hereInfo in from previous neuronaction potentialrelease chemicalsInfo out to next neuron