Nervous System Membrane and Action Potentials

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Nervous System 

 Membrane and Action Po ...Neurons are the cells in the nervous sys ...Like all cells, neurons have Na-K pumps  ...Recall that pumps move substances up the ...Na+ pumped into extracellular fluid (out ...K+ pumped to intercellular fluid - 2 ion ...Cell membrane is relatively permeable to ...K+ leaks out (due to concentration gradi ...K+ continues to leak out until the force ...-70mV is the resting potential (or membr ...Neuron are electrically excitable due to ...Shape of cellAxons are very long, single processes th ...Membrane proteins that allow for electri ...Membrane proteins can be channels or gat ...Some of these are voltage regulated chan ...Voltage regulated Na+ channels are impor ...When the membrane is depolarized (the in ...Nearby voltage regulated channels will t ...Some are chemically regulated channels t ...Ex) Receptors that bind ACh at the NMJ ( ...ACh binds to these receptors and open Na ...Na+, free to move down its concentration ...Nearby voltage regulated channels will t ...Some are mechanically regulated channels ...Channels associated with sensory recepto ...These initiate an action potential that  ...Membrane and Action PotentialNa-K pump creates resting membrane poten ...Depolarization of membrane opens channel ...Na rushes in due to both concentration g ...Local membrane becomes depolarizedIf enough is depolarized, voltage gates  ...Na-K pump returns mebrane to resting pot ...Special secretionsSecrete neurotransmitters which allow fo ...
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Nervous System

Membrane and Action Potentials

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Neurons are the cells in the nervous system

that conduct impulses called, action potentials

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Neuron are electrically excitable due to several properties
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Membrane proteins that allow for electrical excitability