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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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;bkfafeeol@cc

nnIsuil soed paly a relo ni gibnnrgi back K+ nito leslc avi aunotodlim fo H/+K+ nex.eghac sThi is aesuebc ti psleh to sddesra het oiceaictdtok ttesa of het eai.nptt By irgningb pH losrce to elebi,sna ereth is rrtuen fo +K inot het cls,el hliwe H+ omcse akcb uot of eht s.clle

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an_improved_me  r,weoHve ouy rae ,trghi in htta oto my ewnkdog,el ttah is ton the iamn way isnuinl ieuenlsfcn K+; it si eorm vai eth APeNaTas as ouy heva emonenit.d +1


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submitted by โˆ—nala_ula(127)
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In eiiabtdc eaci,dtkssoio heetr si dceesrani dica ni eht altclarlexuer es.acp nogiAdccr to FA reeth si a urclarsalenlt isfth ued to eadsdecer snnliui atht laesd to rmoe H+ rneiegtn het cell in cahxgeen rfo K.+ hTsi ladse ot elrikyaapehm twih etdeelpd caarnlureillt otssre fo +K. reehT si aols itosmoc usirdise atth deals ot drnisacee K+ olss in eth uienr dan tlaot dboy +K eiptl.dneo hTe tinesuqo sask ttha si mtos eklyil to eeeardsc iwth nuisinl e:aprthy ermsu omtspiuas ocrncttenioan illw ederaesc as K+ si now agexdchne fro +H iseidn eth l.cle

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cienfuegos  dnatilAodi UW ufn cfsat gngdrarie uPitassom nda eDKs:u A oatniuc iinggv nniulis dan VI fdsliu ot dhtdrdeyae ehcyigerlmcpy baecuse i ofersc K ni lslec gnacisu tsfa ceeaders fo rreclxllueata mssitaou,P tush iveg K lpaipnnmseuotet neve nweh ermsu K eelvedat +3
linwanrun1357  Wyh nreiu K+ seod ton areese?dc +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 ergea tath Smrue K esderace si het ttrebe eas,nrw btu ldwot'nu erUni K alos ecrasdee ceon obold rugas esog dnwo hwti snilnui trntetmea .(.ie oomitsc uessrdii udlow sl)?eesn

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