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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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cfekfa;obl@ce

nlusIni osde pyal a erlo in inggnrbi bcak +K tion lcsle iva ladoiumton of H+/K+ nehga.xce ihsT is ueabesc ti sleph ot sesdard teh ockdttecoiia eatst of eth .aineptt yB iinrbgng pH secorl ot a,neeslbi rethe is nrertu fo +K onti the scl,le ihlew H+ escmo bakc uot fo the lce.sl

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an_improved_me  He,rovew uoy aer grht,i ni ttha oto my oglenkdwe, thta si ton het aimn way unlinsi linscefnue K+; it si mero vai the sNAaTeaP sa ouy eavh .idmennteo +1


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submitted by โˆ—nala_ula(127)
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In eitbdica tks,ceiodaois three is sadreiecn dcai ni eth rrlultexaclae a.pesc rdncoAgci ot AF erhte si a lsruntlcraale hfist eud ot darceedes lnisinu ttah edlsa to omer +H nneetrgi het clel ni ahecnxeg orf .+K iThs sedla to rplkyimeehaa thiw dtepdele tlrnaluiaelcr tesosr fo +K. heTer is olsa mosctoi sidiusre thta asdle ot dcaeirsen +K sols ni teh nerui nda talot ybod +K tne.pdleoi heT oseuiqnt ksas ttha si smto elykli ot rdsaeece whit nnlsiiu y:hrptae esurm pmtuaoiss cconeottnnair wlli sedecrae sa K+ si now ehgedacnx ofr H+ dinies the lcl.e

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cienfuegos  ioaltdidnA WU fnu scaft nreaigrgd Pouamsits nad K s:DeAu tacoiun gvngii uilnnis nda VI flsiud ot dehyadrtde hgyccempylier ceseuba i rfsoec K ni escll cuiasng fats dsceeaer fo lelurtrealacx mtiuo,sasP uths evig K nppuetoesmntila even nehw emusr K valeeetd +3
linwanrun1357  hWy ienur +K odse ont dease?ecr +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 aereg thta rSeum K ecrdeeas si the eebttr ern,saw but nud'wtol rUnei K osla dscaeeer econ odblo urasg oges dnow ihwt uilisnn enamerttt (e.i. isoctom urisides wlduo ss?en)le

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