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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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a@fcob;klfece

unIlnsi soed plya a leor ni igngnbir back K+ tion lelsc iva utaindolmo of H++/K a.hgnceex hiTs is usbecae ti lshpe ot esasrdd eth kcaiiodotetc setta of eht .einptta By gngirbin Hp rleocs to ,ebilasen ereht is rnutre fo +K oint teh es,cll wheil +H cemos abkc uto fo eht se.llc

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an_improved_me  eoevrH,w yuo ear r,ithg in ttah oto ym owgeden,lk tath si nto eht mani awy nsiiuln ulsniecnef K;+ ti si rmeo avi eth NePAsTaa as you vhae mniten.doe +1



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submitted by โˆ—nala_ula(127)
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In icaebdti tekisco,odasi trehe is acneeisrd icad in teh ltereulrxacla caps.e dicnocgrA to FA htree is a tsllceruanlar ishtf edu to erddcease nusnili thta easdl ot erom H+ egnirten het lcle ni excaghen for .+K Tsih aesld ot aaierymkehlp tiwh deepdelt raituerncllla sreots of .+K reheT si oasl icoomst erssiidu htat lsdae ot ieeacrnsd +K lsos ni teh nurei nda ttoal boyd +K onept.ldei The usnqtieo sksa atht si most eilkly ot eceaserd tiwh nsluini ehrtpa:y emurs putisaoms cnotrtnonieca wlli aesecdre as K+ si now andheexcg fro H+ neiisd eth elc.l

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cienfuegos  dlotainiAd UW nuf ctsfa erggadinr osmPsaiut and KADus: e oaciunt vigngi insiuln and IV sliudf to yaedddhrte eygccrlmieyph cebeaus i ercsof K in llces gusncia tsaf aedeescr of reaacullextlr uoi,tassmP tsuh ivge K nlasttpnmouepei eevn newh rmesu K tleeadve +3
linwanrun1357  Wyh irune K+ odse not ?ecardees +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 greae atth mSuer K racseede is eth bteret raewn,s tbu dolu'twn iUner K also cseeread ocne dbool asrug oegs donw ihtw nilnsiu ntermaett (.i.e ocmstio drsieuis lwdou ?nsels)e

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