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Retired NBME 19 Answers

nbme19/Block 0/Question#0 (reveal difficulty score)
An investigator studying the function of a ...
decreases the amplitude of the action potential 🔍 / 📺 / 🌳 / 📖
tags: Neuro repeat

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submitted by solidshake(25)
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nA AP si regnetdea econ het amsinoumt of haegcr ta hte aonx ilochkl ehcreas a rdheolhst g.etvola Oecn hte hhltreods evoglta si s,speda na PA is egee.nadrt orHevw,e the epka dulmtaiep fo het PA beavo odhrhsetl nac lstil yrva idndenepg on eht meubrn of Na aenhcsln tath ear usouaymlslntie peon hwlie hte AP si sr.epnet

,Tshu raeft hte PA lodhserth sha neeb rcaehed nad hte AP si eearnge,td eth eakp voetlag atatdeni nac be redduec in ailmtdpeu if het trfsi aN nsalnhce ttha podeen inbge to oecls ceaubse of a thosr ninativctoia mit.e

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namesthegame22  n ufxl I of umalcic romf -nyps.er VG +a+C hnsecla.n d slr ehhto enbmrema aopltetni si ecdhear, VG +Na hlesncna eopn dan hte iartodnapiolze paropagtse nwdo hte spsanptyotci eerbnmm,a rteeringpsne teh luemsc icntoa na o ipetlt. +

  • When acetylcholine binds postsynaptic nicotinic acetylcholine receptors, each receptor causes Its own postsynaptic voltage change, which is called an end-plate potential.

  • The summation of the end-plate potentials represents the membrane potential.

  • The synaptic acetylcholine concentration influences the amplitude of end-plate potentials

  • Blocking presynaptic, VG Ca channels would most decrease the end-plate potential amplitude!


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