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Lecture 4 - Lecture 4 Neurons Neurotransmitters How does...

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1 Lecture 4: Neurons & Neurotransmitters How does the nervous system work? Neurons!! Activity cells of the nervous system Specialized for communication Glial cells 90% of nervous system cells by number Support neuron functioning Types of Neurons Sensory neurons Motor neurons Interneurons Everything else in between Most neurons in the central nervous system Specialized Functions of Neurons Receive information from neighboring neurons Integrate this incoming information Transmit signals to other neurons
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2 How do neurons send signals? Electrical impulses Action potentials (neuronal firing) Within a single neuron Chemical signals Neurotransmitters Between separate neurons Basic Structure of a Neuron receive info Info in from previous neuron action potential release chemicals Info out to next neuron integrates info Incoming Signals Chemical signal received by dendrites Excitatory “Yes, send this message!” Increase likelihood of action potential Inhibitory “Stop this message!” Decrease likelihood of action potential Cell body adds signals together Enough excitation Action Potential Basic Structure of a Neuron receive info Summation of all received info occurs here Info in from previous neuron action potential release chemicals Info out to next neuron
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