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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 gentedare oecn het msaminuot of geharc ta hte xano lkoclhi crhease a leohsthdr gvlateo. cnOe eht hlsdroteh alvoget si ae,pdss an AP si angee.dtre Hwor,eve eht ekpa tdluepmia fo eht AP veoba hehtosdrl acn tllis vray dnngdipee on het ubnerm fo Na eclnnhas ahtt are mtsuyuosillane noep whiel het AP is rse.pten

sT,uh terfa the AP stlerdhho has eebn cadhere dna eht AP si degntera,e teh peka avetlog ntdeitaa nac be cuerded ni mlpitduae fi the fistr Na annhlces that dopeen nibge ot lsoce ucaseeb of a sroht octtaaniivin .ietm

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namesthegame22  I fulnx fo ccaulmi fmor rsnype.- VG Ca++ ensaclh.n ht sdorel h emrnbeam ttelnpaio is arehecd, GV aN+ anclenhs pnoe dna het todarlipnzeaio aepsratgpo down hte aicpyopsntst ameenmr,b restgpeernni eht meucls tainco tt pa.lonei +

  • 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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