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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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;ce@afcfeklob

nusnIil does ypal a loer ni riggbnin cabk K+ oitn leslc vai alootmdiun fo H/++K gaxc.hene hTsi si bueasce ti lphes to redasds hte ieiktdoaotcc attse fo eht tiptan.e yB ngrbinig Hp lsocre to ilb,nesae ehter si rutnre fo +K niot the s,elcl hilew +H ecoms bakc otu of teh ecl.sl

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an_improved_me  ,Hwrvoee yuo are r,ghit in taht oot my leon,kdewg hatt is otn the nmia wya nsiilun nlnieesfcu K+; it si mroe via the AasaNTPe sa ouy vahe md.eenonit +1



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submitted by โˆ—nala_ula(127)
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In itecaidb oikietcossa,d erhet is erenacsdi adci in het cutrrlalleeax scp.ae ncodAgrci to FA rethe is a ltnlalearcrsu ithfs eud to dedsrecae nnsiuil thta ldesa ot reom +H genetrni eht llce in egeacxhn rof .+K This aedls ot yklpmreiaahe wiht dlpdetee turacaeillnrl essort fo .+K Tehre is aosl isctomo srseidiu htat dasel to esdecianr +K ssol ni the nerui and altto odby +K toepl.endi heT onteqsiu akss ttha si stmo leykli to eerdecas wthi sinniul pehtya:r semur ssitaopum enctnonctoiar liwl cdaseeer sa K+ si onw chdeanegx ofr H+ seniid teh .llec

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cienfuegos  toidnidaAl UW fun fcsat naggreird siautosPm nda AsDK u:e ucation ignigv snuinli and IV fdisul to dyheeddtar cmlgiyrhpeyec aesecbu i seforc K in sclel cusgani stfa cdaerese fo lauxalrlretec atu,ssPimo tush iegv K liemteatpsunnop evne hewn rmesu K teealved +3
linwanrun1357  yhW euirn K+ deos ton reaecd?se +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 aegre hatt Seurm K aerceeds is eth etertb weras,n btu t'wulnod reiUn K soal edascere enco dloob ausrg gsoe ondw wtih uiinnsl atetnmter (.ei. oitomcs eduiriss wdoul s?)eelsn

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