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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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@eakcbe;foclf

luinIns dseo lpya a lero ni ingbingr cbka K+ tnio leslc vai amluotndio of HK++/ aexh.genc Thsi si eausceb ti eshpl to edrassd eht ioikeoatcdtc testa of teh .npetiat yB irbingng Hp oslecr ot a,ibeesnl ethre si teurrn fo +K tnio the lcsel, lewih +H scome bcak uto of teh lescl.

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an_improved_me  e,wHeorv ouy rae gthir, ni htta too ym dlk,geenow ttah si tno hte inam ywa luisnin icfelnensu K+; it is rmoe aiv the TPaseANa as oyu ehva e.ntendoim +1



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submitted by โˆ—nala_ula(127)
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nI iitecbda o,stsoiicaedk hrete si ciaeednsr dcia in hte reuaxclrlelta asp.ec igAcdnrco to FA rtehe si a anluelrcatsrl istfh edu to rdsedaeec iilunns hatt alsde ot rmeo H+ enintger eht llce ni ngxeeach ofr .+K sTih selda ot airkyaemlhep thiw peeedltd alclleirntrau osrste fo .K+ reeTh si aslo oocmits rsiusdie atht ealds to naeisdrce K+ olss ni eth eruni dan tlato doby +K eiotd.npel Teh inqsuote ssak htat si tmos llekiy to ecdsaeer itwh niulins hap:tery sreum ssiapmtuo nrottnoeacnci wlil scedreae sa +K si nwo xgeechadn fro +H nisedi eth cell.

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cienfuegos  datilnoAid WU nuf actsf dniggraer taosmiPus nad :DKeAus outncia gvinig niunsli nda IV liusdf to dhddyaeetr mlegycchrpiye aebcuse i seorfc K in cesll acsunig tfas craeeeds fo rlllcearteaxu soa,tmPusi thsu give K nsoeielttpunmpa eenv wehn semru K deaeltve +3
linwanrun1357  hyW rnuie +K sdeo tno c?eedaers +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 reage thta Sruem K eeaserdc is teh tetbre r,seanw but unold'wt Uerni K oasl ecesrdea enco dlobo gusar gsoe nwod twhi lninisu rtetmaten e.(i. cisomot uiedriss douwl els)ens?

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