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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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;ecfbkcoe@fal

sunnlIi odse aylp a lroe ni igbnrngi kcba K+ onit llesc avi oundtamlio fo +KH/+ eghcxnea. hTsi si sebucea it hlsep to redasds the tckioiecdoat tsate fo hte itae.tpn yB inngirbg pH orsecl to ,eselanib rethe si ternru fo +K nito het ,lelcs eliwh +H omsce bkca uot of het lslec.

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an_improved_me  eHvwo,re oyu rae t,righ ni atht oto my odlgeknew, atth is tno eth nmia ayw uninils nicfleensu +K; ti is orem via the asNPAeaT sa ouy vahe ometdine.n +1



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submitted by โˆ—nala_ula(127)
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In aitebdic iskscideota,o rethe si draencesi adic in teh allleatuerxrc as.cep dAroigccn to AF theer si a rtsalllnrueac thsfi eud ot dserecead nsliniu htta sdael ot emro +H ergtnine teh clle in hncgeeax rfo +.K Tihs salde ot kpilyremehaa htiw peteddle rlitalunrelac srtoes of K.+ eTerh si sloa omcosti esusidri htta dseal ot isancrede K+ ssol ni hte uerin dan atotl obyd +K epenil.dto eTh utsnioqe skas thta si mots ilkyle ot daecsree thwi islunni t:hyprae ermsu uiotsaspm ntictncrnoeao ilwl eesdacer sa +K si nwo aecnxedgh rfo H+ sdeini hte ec.ll

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cienfuegos  diAonadtil WU ufn cftas gadenrirg oPsstiuma dan DAeKsu: tuocian gniivg iniunls nda VI lsduif to yddedaerth epchgyymciler usebcea i fsrcoe K ni sclel unacgis afst acdseeer fo ateurlacexlrl uPa,ismsto thus gevi K ienopnlaeutsmtp eevn ewnh umrse K tvdeleae +3
linwanrun1357  yWh nirue K+ sdoe nto r?deseaec +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 that reuSm K edresaec is hte tetrbe r,nwsea utb l'towdun nierU K aols reeadsec ocen oodbl ruags egos wnod with nniilsu rtetmetna .ei(. cosimto seiidrus uwodl nlss?e)e

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