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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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@ekffcolbce;a

inulIsn sdoe ypla a roel in nbngirig back +K noti lcsle avi oonditumal of K++/H hncegea.x siTh is bseaecu it elpsh ot sesrdda eth ocikeotaidtc attes fo eht .tpnieta yB igignnrb pH esclro to leni,sbae reeth is trrneu of K+ into het s,lcle wehil H+ oscem abkc tou fo eht .lelcs

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an_improved_me  H,ervewo ouy era trgih, ni htat oto ym ke,elnwdog atth si ton eth nmai ayw nislniu fusicelnen ;+K ti is mreo avi hte AseaTaNP as yuo aveh dnimno.tee +1


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submitted by โˆ—nala_ula(127)
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nI tiedicba acosos,kediti ethre is eacndesir iadc ni teh rlalextlcraue ecs.ap ncrgdcoAi ot FA tehre is a lstllrurnaace stihf eud ot screeaded innusil htat deasl ot mroe +H renngite eht clle in aenchegx rof .+K Tish adsle ot apimhyaklree ithw eededplt ailertcalrnlu toessr of +K. eeTrh si lsao citomso isdsreui atht aleds ot ersencadi +K lsos ni the rueni nda ttola ybdo K+ oetdipne.l The nsuqeiot sask atht si otms lkylei to raeecsed twhi iuinnsl tp:ehary esurm uitsaopsm noetartnncico lilw reeeascd sa K+ si won eaxcgehdn ofr +H iesind het l.elc

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cienfuegos  tniliaAddo UW unf ftacs eiarrdggn tPauomiss nad :AKeDu s tucanoi ngviig uilnsni nda IV iulsfd to drtyadeedh rpgmeecyhclyi ueescab i fosrce K in leslc icnsgua fats seearedc fo lerlexlraautc Poia,smsut tush ivge K lpmtaestnpeuoin vnee nweh rsmeu K eedetalv +3
linwanrun1357  yhW ruein K+ oeds tno sda?ereec +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 rgeae thta rSume K sceredea si eth bttree aswren, but otlwnu'd nUeir K lsoa aerdcese enoc oolbd surga oegs donw whit ninsuli amtternet .i.e( ocomtsi uressdii dlwuo l?ensse)

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