Lesson 9 - Lesson 9 Communication via Neurons Organization of the Nervous System Nerve Impulse Transmission Electrical potential o Inside more negative

Lesson 9 - Lesson 9 Communication via Neurons Organization...

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Lesson 9: Communication via NeuronsOrganization of the Nervous SystemNerve Impulse TransmissionElectrical potentialoInside more negative than outsideStimulation causes electrical changesMembrane transport proteinsoIon channelsLeakageGatedOnly open in response to stimulus
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oSodium potassium pumpHelps establish and maintainconcentration gradient forpotassium and sodium The Sodium Potassium PumpEstablishment of the Resting Membrane Potential
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Channels make it leakyInside the cell are a number of negatively charged proteins and amino acidsResult in the build up of charged differences across the cell membrane known as resting potentialCharge differences are analogous to a polaroid batteryAverage resting potential = -70 mvDisruptions to the resting potentialGraded potentials: small continuous changes to the membrane potentialoDepolarization (less negative)oHyperpolarization (more negative)Gated Channels (normally closed but open in response to a stimulus)oChemically gated channels Acetylcholine binds to the receptor Binding causes the channel to open allowing sodium to diffuse into the cellSince sodium is a cation this causes the membrane to be less negative (or depolarized)oVoltage gated channels
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