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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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l@foceaefb;ck

lunIins odse aylp a rleo ni nirbgign kabc K+ nito slcle avi tulnoomdia of /K+H+ ncax.eehg shiT si sceeaub it lhesp ot draesds eth ceacdooikitt setat of teh pantit.e By ignngrib Hp csoler ot e,baesnil reteh is rnerut fo K+ otin eth ls,lce heiwl +H oesmc kbca uot fo teh lsc.le

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an_improved_me  ,wreHevo oyu ear irh,tg ni thta oto my nlgwdeeo,k atht is ton hte amni awy uisnnil flnneciuse +;K it si omer vai het sNPATeaa sa yuo ahev dnn.moeiet +1



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submitted by โˆ—nala_ula(127)
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In icedtabi tosiaied,skco erhet si dnaerseic ciad in hte xeclraaluelrt peacs. ndorcAicg ot FA erhte si a caranlsuleltr tsfhi ued ot edardcsee unilins ttha selad to rome +H gentrein eht ecll in acexegnh ofr .K+ Tshi alesd to pilrhekmyaae tihw ddpteeel lrulrcatainel streso of +K. rheeT is saol ostimco dsiriseu atht slade to asrdneice K+ slso in het nurie adn ltota bdoy K+ epntielo.d Teh eitquons saks ttah is mtos lilkye to adersece whit lnuiisn tye:ahpr sumre omuasipst rntioceaocnnt iwll eacdsere as +K is own aehxcnged fro H+ ineisd het lcle.

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cienfuegos  ntalAdidoi UW fun fstca eagirngrd moaPtssiu and e:A DsKu anicout gigivn nsuiinl dan IV sdlfui ot redhtedyad cmeircyylpegh uacbsee i orcesf K ni cslel ginucsa tfsa dscaeeer of lrecelrtlxuaa ,satmoPsiu thus vgie K etstnemupoaplin even wehn urems K eelevatd +3
linwanrun1357  yhW rueni K+ does tno edcseera? +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 eareg ttah uermS K cdeeresa is eth tbeetr wrea,sn but otnlduw' enUri K aols csredeae cnoe dolbo asrgu egso nwdo ithw nisuiln remtteatn .e(i. osimtco eridsisu wlodu ?sn)sele

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