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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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k@cl;coefebaf

iIlnnsu sedo play a lreo in igingrnb kcba +K iton lcesl iva ldootnimau fo K+/H+ cnxe.heag iThs si cusebea it pslhe ot edsrdas eth caotocidetik tsaet of het pnae.tit yB nrgiibgn pH ocrsle to anesb,ile tereh is uenrtr fo +K ntoi the ,lcsel ilhwe H+ sceom kbca tuo fo het cs.lel

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an_improved_me  rvoeeH,w yuo ear ,tghri in ttah too my owken,dgel ttah si not eth amni yaw nisnuli uneinseclf K;+ ti si roem via het NaPTseaA sa uyo vhae ni.eneomdt +1



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submitted by โˆ—nala_ula(127)
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nI aiedictb ookt,ssecdiai there is rdesicaen caid in het reaclutrleaxl .sapce ncAigrdoc to FA rthee is a errcasullltna htsif ude ot derasdece lninsiu hatt dalse ot mero H+ nretegin hte elcl ni egechnax for K.+ shTi adels to yekiealphmra hiwt ptdledee atlrcrnualiel trseos of K.+ Trhee si also mctoois duissrei ahtt edasl ot siacenedr K+ slso in eht inure nad toalt oybd +K eptnlde.oi hTe tseioqnu kass atht is msto likyle to craeedes twhi insluin tpae:yhr rmues ouisatmsp ttrccnoenoani wlli sreeadec as K+ is wno dhgxcneae fro H+ ednsii eth ecll.

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cienfuegos  dtAinalido UW nfu ftcas randgrgie uisaPtmos nad e:u sKDA ucnioat iginvg ulnsiin dna IV dsufil to dateehrydd eecclmghiyypr aebusce i coresf K in elscl canigsu tsfa eearcdse fo rclxleltuaera Pit,ssumao utsh ivge K upoitptsmnealen evne nehw reusm K eatedelv +3
linwanrun1357  hyW iuenr K+ soed otn esar?cede +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 agree atth uSemr K saereecd is the tebtre warsen, tub lduwno't neUri K slao dereaesc ocne oolbd usgar oesg dwon htwi ilsninu retetmtan .(.ei cimtsoo isusired udowl lsnsee)?

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