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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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b@olf;ccekeaf

nslIinu seod lyap a eolr ni nibngirg ckab +K itno llsce iva tnlumiadoo of H+/+K eexgcnha. iThs si bueasce it phels to saerdsd het ecoottkidica taste of het nptieat. By gibgrnni Hp scleor to easen,ibl ehert si unrrte fo +K ntio the ecls,l lwhei H+ csmoe bkca out fo teh .lscel

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an_improved_me  r,eHwove uyo era gh,rit in thta oto my eeokdwnl,g ahtt is ont hte aimn wya iuslnin nfcuseelni K;+ it si eomr iva het NaAsaTeP sa ouy vaeh e.imnneotd +1


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submitted by โˆ—nala_ula(127)
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In itiebacd oseadti,siokc ethre si rdaicseen idca ni hte areualcxlertl se.pac oniAdcrgc ot AF etreh si a atrsurlllcnae hsitf edu to eddeseacr uinnlsi thta delsa ot more H+ nirtgeen teh lecl ni ghcexnea ofr +K. Thsi alesd ot aipehmrkayle twih ltdedeep arlcrnlleiatu rssteo of .+K ehreT si osal ciomtso esudisri that sdela to raenicsde K+ sslo in eth inure adn oattl boyd +K lpdeoit.ne ehT sneqituo kass tath is stom leiylk ot redeecas tiwh uisninl hr:aeypt rusem apsmouist toorcainnecnt llwi saecrdee sa +K is onw ehcxdgnae ofr +H iidnse hte lce.l

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cienfuegos  nitdaidlAo UW fnu cfsat rgaedgrin somiPasut nda sA:eK uD cniuato nigvig uisinnl nad VI ifluds ot tadreedhdy gymerhyeicpcl aeebcus i ersfco K in celsl uncsgai tafs srdeaeec fo rrltlxuaaeecl ,iuPtamoss shtu igve K mppttolnasiuene enve when urems K laetvede +3
linwanrun1357  Why eurni +K does ton deersa?ce +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 regae thta Sremu K ecareesd is the tetbre a,serwn but tlnow'ud rnUei K laso dcreesea coen oodlb graus oesg ndow hiwt lunnsii teattrnem e.(i. cmoosit ssrdiieu oulwd sl)?nsee

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