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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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An PA is eegdetran coen the suniatmom of egrcah ta het noax kicohll seherca a horhtlsde taelv.og ceOn eht etdohshlr otgavle si dsa,sep na AP si grd.aneete w,voeHer eht kaep emilupadt fo eth PA oaveb hrtdsoleh nac slilt yavr pgniednde on het enrubm of aN hcsnlnae tath rea eonuuytlasilms onpe wihle teh AP is er.etnsp

,shuT tfrae the AP rtosdhleh sha eebn ehceadr nda the AP is g,rdeatnee eth pkea ogvetal attenaid can be ceurded in pmiduelat if eht ifstr Na lnehnsac htta dponee nibeg ot oslce buecase fo a orhst ntctiaviiona ime.t

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namesthegame22  fx lIun of miuclca ofrm py-sn.re VG aC++ lencn.ahs rstloe hd h abenrmme lapeitont si eaedcr,h GV a+N ascelnhn poen nad teh aidnilorpeoatz roategsapp owdn eht ytcaosispntp ,ermnmabe rteneneigpsr teh leusmc aoicnt enatitpol. +

  • 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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