L9nervsyst_sp10

L9nervsyst_sp10 - Cell Communication in the Nervous System...

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Unformatted text preview: Cell Communication in the Nervous System Overview: o The nervous system has three overlapping functions: sensory input integration motor output The vertebrate nervous system o Organization: Central nervous system (CNS): brain and spinal cord Peripheral nervous system (PNS) is everything outside the CNS, transmits information to and from the CNS and regulates the internal environment of the organism. o How the nervous system communicates The neuron Most neurons have the same three parts: o Dendrites: collects electrical signals o Cell body: integrates incoming signals and generates outgoing signal to the axon o Axon: passes electrical signals to dendrites of another cell or to an effector cell. o Action Potentials: nerve impulses Voltage-gated ion channels Resting state Threshold Depolarization phase Repolarization phase Undershoot All-or-none response Saltatory conduction: the action potential does not actually travel along the axonjumps along...
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L9nervsyst_sp10 - Cell Communication in the Nervous System...

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