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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 si dregneate ceno the uimmsoatn of cghare ta het nxoa loiclkh aeescrh a tdhoreslh tloeagv. ceOn the rodhethls gtolaev si sep,ads an AP is neer.atedg oHewevr, het kpea ediltumap of teh AP avbeo lderoshht cna isllt rvya dngeinpde no the mbneur of Na snlcaenh atht aer lumlontyeuissa npeo eliwh the PA is er.stpen

Tu,hs ratfe eth PA rtdhslheo has eenb aceerdh dan eht AP is ,eeeadrtgn hte apke atolveg tiaedtan acn eb drecude ni tdmailepu fi eht sritf aN ansehnlc atht dnpoee gnbie to ocsle eubscae of a hsrot ctaavoinniit .emti

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namesthegame22  xf Inu l of uilmacc rofm rnpes-y. GV +C+a cnlehs.na delso h th r enamebrm lpeiatont is edchear, GV N+a lahnecns neop and het ldeoinairtzapo opspegatar wond eht capyotnpssti nmmeb,ear inprgeresten eht smclue tcanio .ptaloei tn +

  • 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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