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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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ecakf;blceof@

siuIlnn osed lpya a leor ni inrgbnig ckba K+ onti elcsl iav oaltodnmiu fo /++HK aench.gxe hTsi si eubecsa ti phles to esdadsr eth eatditckooci tstae of eth tnp.teia By ignrinbg Hp rocles to esie,abln herte is retnur of +K toni eth l,elsc lehwi H+ seomc abck uto fo eth s.lelc

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an_improved_me  rweHeov, uyo are hti,gr in ttah too ym wegenolkd, atth si otn eth inam ayw nnisuil cnenfilues K;+ ti si remo iva teh asTeNAPa as uyo vhae mdnetoe.in +1


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submitted by โˆ—nala_ula(127)
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nI aeitidcb d,cosatsieiok rehte is dsraceien adci in eth relalluecxrta csp.ae Andgccoir to AF reeht is a lastnlrcealru itfsh ude to eceseradd inliuns tath elsad ot mreo +H tnrngiee eth lcel in exhngeca for K+. sThi asled to maleheayipkr whti eddltepe rllnceiuatarl esstor of .+K There is olas csitoom esiisurd htta edasl ot aeciderns K+ olss in het rnieu nda ttoal boyd +K pdle.eonit Teh inqstoue saks taht si smto lieykl to eresadce whti sniulni :rytaeph umres tsimsoupa nercitntnaooc lliw rdsaceee as K+ si own gchaeednx orf H+ diisne the ecl.l

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cienfuegos  taoAilindd UW nfu fsatc agrdigrne siumoaPts nda :Ks euDA ounctai iivngg sniiuln adn IV udifls ot ydhatdrdee irlcyemphcegy suaceeb i ofscer K in lecls uiscagn sfat reesecda of etlreaurcllax P,stosumia huts ivge K lppontemantuise veen hwne rmuse K elveedta +3
linwanrun1357  hyW rnieu K+ dseo not eces?reda +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 gaeer ttah Sruem K reesadce is hte etertb ew,asrn ubt nlutw'do eUrni K aslo readesec noec dbool ausrg sgeo down iwht niuilsn neatrtmte (e.i. imotocs uriedssi ulowd ?eeslns)

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