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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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e@lckca;ebffo

nsluIni dsoe lpay a oerl in ingnbgri kacb +K iont sllce aiv moiuotdaln of H++K/ anhxgeec. hTsi si uebecas it hlpse to saerdsd hte odcicikeatto atste of eht ptet.ian yB iggrnbni Hp lceors to eienl,bas teehr is urrnte of +K tino eht lcse,l wheli +H escom ckba tuo fo het s.ellc

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an_improved_me  eroew,Hv ouy aer ht,gir ni htat oot ym knledeo,gw ahtt si ont eht amni wya iunslin uefelsnnci +K; ti is rmoe via hte TsANaaeP sa ouy haev dnm.ineoet +1


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submitted by โˆ—nala_ula(127)
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In itcibdae csiooietdas,k rheet si esceindra cdia ni teh tulxerclaaerl epa.sc crcidognA to FA rteeh si a utnelsaalrclr ihtfs deu to decsdaree iiulsnn thta ledsa to mero H+ ngetrnie the ellc in exgeachn fro .+K Tish aldse ot erempialyakh whit deptedel utalirclnaler tesosr fo +K. Teher is osla mitocso suiesdir hatt sdlae ot rceiedans K+ sslo ni teh renui dna aoltt doby K+ tedpn.oile eTh niuotsqe sask ahtt si omst ikleyl ot ereascde iwht nnusili atrh:yep mrsue spusotima ntacoennorcti illw aserecde sa +K si wno andhgxece fro +H sdniie eth .llec

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cienfuegos  oiAtildand UW ufn ftsac agdrgienr oasPsmtiu dna Aus:Ke D tncaoiu nvgiig innsuil nda IV usdlfi to adedtdhyer riyeyehmcplgc eaeubsc i cfeosr K ni lslce nasiugc atfs rseaecde fo ecrtlxlarealu tPsasio,mu htsu ivge K oaneletpnpsitmu enve nweh emurs K eevelatd +3
linwanrun1357  hWy ruine K+ dseo not sredaece? +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 eager ttah rmueS K dsrcaeee si eth ertbet an,srwe utb on'ltwud ireUn K olas rsdeceae nceo obodl grsua osge onwd whti nnuliis ttnraetme ..ei( omcstio derssiiu owdlu lens?s)e

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