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Retired NBME 21 Answers

nbme21/Block 1/Question#37 (reveal difficulty score)
A 35-year-old man with diabetic ketoacidosis ...
Serum potassium concentration ๐Ÿ” / ๐Ÿ“บ / ๐ŸŒณ / ๐Ÿ“–
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submitted by โˆ—an_improved_me(91)
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bl;fcceak@feo

snulIin seod yalp a elro ni iibnngrg bcka K+ into lcles via ioaudomtnl fo H/+K+ ch.gaxeen Tshi si csabeue ti peshl ot desrasd eht ectitoidcaok etast of hte pieattn. By iinnrggb Hp reclso to el,asbnei htere is teurrn fo +K into hte llce,s wihel H+ mesoc cbka out of hte c.ells

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an_improved_me  Hrw,eevo you are ,girht in htat too my enlkdweo,g ttha si ont eth inma ywa niusnli eufncilens ;+K ti si emor iva teh PATNaaes sa you aevh tne.donemi +1



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submitted by โˆ—nala_ula(127)
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In diatecbi ostic,aeiodsk ehert is neisearcd adic in het ltelarxarucle sace.p roiAcgncd to AF theer is a ascealntlurrl ifhts deu ot eecersdda nnisuli tath sedal ot mroe +H trinneeg the cell in nxceehag orf +.K ishT eslda to pemkiarhyeal whti deedpetl lliurnelctraa estsro fo K+. erTeh is oasl ooctsmi usedsiri atht leasd ot iednrsaec +K olss ni eht uiner dan ttola doyb +K do.epelint The intqoseu sska atth si tosm ikeyll ot ecesdaer thiw uisilnn hy:ptrae serum stumspioa nocniterotnac wlli saeedcre sa +K is own ndehacxge fro H+ sediin the .ellc

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cienfuegos  tnoadAidil UW nuf facts rngeadrig smtoPuisa dna DK :eusA cinauto gngiiv liuinsn nad VI iusdlf to yadhderdte yrpegeiyhlmcc cebseua i recosf K in clels gsainuc tfas ecesdrea of xlrlecetlraau ioP,ssumta tsuh egiv K nspeialetupomnt enev wnhe eursm K eeadetlv +3
linwanrun1357  hWy uneir +K sode not eecrdse?a +3

This explanation is faulty. Insulin causes K to go inside via upregulating NaKATPase activity. Nothing to with H+ exchange as far as Insulin is concerned.

H and K exchange is separate from this.



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submitted by โˆ—peachespeaches(2)
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I reage hatt rumeS K seeeadcr si the ettber ea,rnsw tub tnlwd'ou eUinr K oals dseceera neoc odobl argus sego ndow twhi ilnsuni teetamtrn i.(.e imctoso isueisdr lowdu ?ele)nss

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