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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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cl@ebfekoac;f

nlsinuI dseo ylap a orle ni ngbnrgii abkc K+ niot lcesl iav nouilomdat of /K++H he.anexcg shTi si aesbeuc ti hlsep to easddrs het odtiaioecckt taest fo het atentip. By gignnbir Hp elcrso ot n,iebslea eetrh si urrten of +K iotn hte les,lc ihwel H+ mcoes akbc tuo of hte lls.ec

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an_improved_me  er,Hveow you era ,hgrti in hatt too ym wlnedekgo, atth si otn hte mnai awy unisnil eninesfclu ;+K ti si orme via het aANTsPea as yuo heva ednton.ime +1


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submitted by โˆ—nala_ula(127)
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In tcaidieb eioi,kdactsos teerh si csriadeen idca in eht lctlrelareuxa apc.es cdgrniocA to AF heret si a ncalurrselatl fhtsi edu ot reeecsdad innsiul htat aedls to eomr +H ngneietr teh lecl ni eecagxhn for K+. ishT lsade ot ipkaamrelyhe htiw dlpeetde nlctrillruaea esostr of .K+ heeTr si sola cioomst rsiuedsi atth aedls ot dneasreci +K sslo ni eht renui nad ttoal ydbo K+ d.itpenoel ehT usqtnioe sska taht si tsom ylklei to erscadee iwht niunils rahyept: esrmu atssopumi nctociotrenna lwil ecseader sa K+ is won dgcaxnehe for H+ dnsiie the clel.

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cienfuegos  Aidndiolta WU fun tfcas gnargidre sasotimuP nda su DAe:K iconatu ggiivn ninulsi nad VI lsfdui ot etdayhdder cygerhmclpyei ceasube i sercof K ni cesll cugisan tasf rdeeaces fo uealtxlelarrc siaPuo,mst htus vige K uoimaeltnpntesp eenv wnhe rmues K veadlete +3
linwanrun1357  Wyh eruin K+ seod otn e?cesdare +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 gerae atth uSemr K reascede si het rtbete ,wsanre tbu tl'nuodw iUenr K oals rcdeease ceon lbood gsuar esgo wdno ihwt lisnuni tenetrtam ei..( ocoimts seusidir louwd e?l)sens

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