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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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;fkcecb@eolfa

ulIinns odse pyla a role in gninbgri bkca +K iont slcle avi mdnuoltioa fo +H/+K hcxae.egn shiT is esuabce it pelsh to sdarsed het ctiatokceiod atest fo eth ptinae.t yB ignbirng Hp srecol ot benelsa,i teehr si eunrrt fo K+ toni teh cl,les eilhw H+ osmce bkca otu fo hte cl.lse

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an_improved_me  orewevH, you are rtgi,h ni ahtt oto my nwldokg,ee tath si not the amni ywa lniuisn usnniefelc K;+ it si eomr iav the saPANTea sa oyu evha ntm.oedien +1


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submitted by โˆ—nala_ula(127)
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In atidcebi kcaiodsto,ise rheet si eidesnacr cida in eht alxetaulrlrce eascp. gdiAcncor ot FA there si a nratcleallrsu htisf ude to dcereaesd niiunsl hatt lsdae to oemr H+ nntirgee het llec ni gehaecnx for K+. ihTs aslde ot payrekehliam hwti dlteedpe ciatrrnalleul steosr of +.K heerT si lsoa ictmoso desrusii atht aelds ot erseanidc K+ sslo ni hte uerni nda ttaol yodb +K nil.dtpoee The nseqituo skas htat si mots ieykll to seecdrae htwi ninsilu thpreya: srmue soptimaus citcrotnneano will casedeer as +K is wno xdeehgcan rfo +H eindsi eht ecll.

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cienfuegos  taAoddlnii UW unf fctas anrigedgr maosPtsiu adn : seAuDK auocint igivgn slnniiu nad IV dlsfiu ot ryhadtdede geechpyrcmliy sueecba i oecfsr K in sllec gsucnai afts desecaer fo rtxlclareelua oa,ussPimt huts ivge K mntpeuoisnatelp vnee wneh remsu K eadvelet +3
linwanrun1357  Wyh nreiu +K esdo not rdseeae?c +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 rgaee ahtt emurS K eraesdce is hte trbtee ws,enra but nlot'duw Urnei K sola deseaecr neoc bldoo saugr oseg owdn thiw iunlsni eaetnmttr i(.e. moitcso seirisud wudlo ese)s?nl

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