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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;ekcfeloc@bf

Iuisnln odes ypal a erlo in ingnbgri ckba +K itno slcle aiv oildutaonm of +K/H+ e.xegncha hsiT is esbeuca it ehpsl to adssdre teh aoteoctckdii atets of the i.atpent By nrgbngii Hp lescor ot bnelias,e tereh is rrnuet of K+ niot eht lel,sc ewilh +H ocesm akcb uot of teh l.elcs

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an_improved_me  Hvr,woee uyo era h,rtig in atth oto my kd,enwoleg thta si ont teh naim ayw islnuin lsnenecfiu ;K+ it si oerm avi eth NPeAasaT sa uoy have nme.dinoet +1



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submitted by โˆ—nala_ula(127)
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nI bcidiate aisoodcskeit, rheet si nreascide cida in the craaelullrtex ec.pas Acocdrgni ot FA rheet is a leltalnrraucs tfish ued ot eeacsdrde lniisnu that sldae ot erom +H gnireetn het ellc in xceeghan ofr +K. Tihs seald to emhakieylapr thwi eetepddl nrlarlaucleti rsoest of +K. heTre is oasl mictoso ressduii that dsael ot dneiarecs K+ slos ni the reiun nda ttloa oybd K+ tpneod.ile The utesoiqn akss hatt is somt elyikl ot derecesa twih lniisnu r:hpaety sruem imaupotss nocnorettnica lwil dsereeca sa +K is onw ehxdgenac fro H+ densii eht elcl.

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cienfuegos  Aoinadlidt UW fun tsfac ranrggedi aimotussP nda e sDu:AK niaotcu igivng snlnuii adn IV ldiusf to ededyahrtd rpymeiccyeglh bueseca i freocs K ni lcles sucaing tfsa erseeacd of tcerlleaxlaru ,sPmuoaist tush eigv K spiumpnoatteenl enev enhw srmue K dtavelee +3
linwanrun1357  hWy euinr +K osde ont ?rsceeade +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 ttha euSrm K edacrsee si het tbtere ,awrnes utb oundwtl' iUren K laos eescedra noce oolbd gausr egso ondw iwht niiusnl rtetentam e.i(. tcooims rsisideu ludwo nl)ee?ss

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