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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 is eenagerdt nceo het usmatinmo of rcgahe at teh onax ckohlli screeah a shdloreth .gtoelav cOne hte sldthroeh goetavl is sep,das na PA si enreta.ged vHowe,er eht keap dlpaeuitm fo eht AP oabev hedhrtsol nac tlsli yrav eendindgp on hte umrnbe fo aN lnhnaesc atth are unaeulmitlsyso oenp hwile hte PA si p.eertns

sT,hu afret teh PA oetsrhhld ash neeb ecedrha dna the AP is ge,dtenaer eht peak gvotael atiadnet acn be cerddeu ni elpuditma if the itsfr aN enanshlc atth enepod eginb ot cosel bueesac fo a osthr natiocvintia t.iem

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namesthegame22  l nx Ifu fo cmiulca rmfo prs.ey-n VG a++C ehnscal.n h eodth s rl amrnebme eptotailn is eae,chrd GV +Na escnnalh epno and the aadliooznripte esparagpto ndow hte aptscnyotpis ean,mbmre tprsernnieeg eht elucsm cainto a potn.tile +

  • 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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