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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 enetardge enoc the tiusnmmao of arhgec at eht anox ilkhocl ceerash a lhhrsedot loaeg.tv enOc the rhetsldho tgleaov is saepd,s na PA si tgarn.eeed ,vwHeore eth ekpa eaipumltd fo eth AP vebao seotdrlhh cna tisll vyar ienpendgd on teh reubmn of Na nchselna that ear eysslutuonmali pneo wheil het AP is tsrn.epe

,suhT tfera eht PA elhhrotds sah nebe harcede dan het AP is daetgrn,ee teh ekap toevgal ateiadnt anc eb cereudd ni imuadptel if het itfsr aN nlhnecas atth neodep being to elsco becaues fo a sothr tvaitaonnici m.iet

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namesthegame22  lfxu n I of mlacicu fmro .ynspe-r GV +Ca+ s.nncelah ehdsh rl to merenbam ntoteaipl is d,crheae GV +Na nsechlan epno dna hte ediopraotlznia eopratgpsa wond eht cpiptosaystn rmm,aeebn ersrtepgneni the lcsume cnoiat eniop.tlta +

  • 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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