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NBME 21 Answers

nbme21/Block 4/Question#25 (56.0 difficulty score)
An 80-year-old woman cannot concentrate her ...
2.0🔍
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 +20  upvote downvote
submitted by flashvoyger(20),
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eTh ntsioueq si ngsika you who mchu eawtr umts eth nmoaw keat ni ot niiamatn eth emas soolylai.mt iThs mowna sekat ni 540 msmO fo tleuso rep .dya hiTs si a unti of etamemuensr -- kithn of ti iekl ag.mrs

oFr erh to peek eth sema ymtalisool ehs utms execret 540 sOmm rep d.ay eTh ynol way orf rhe ot tercexe teh stuloe is iva eht dnys.eki heT lyno awy ofr hre iyskedn to cexrtee 405 Omms is if heyt xeceret 1 reilt of ewtra laso. Tshi si eht xma ooccninettrna that ehr siydekn anc uo.crdpe (reH ksydien era ton lp“ofruew ge”huno to mkae erh eniur yna reom enecotatndrc anth tth).a

ihsT onamw is saol liosng raehnto retli of etarw to efes,c gtaiwnes nad ntpois.eirar iThs si eth nlnb“seseii ratew ls.so” aTth asnem if esh olsing 1 itrle fo twrae to ,eatws toenarirsip adn escef pre yad ulps 1 eiltr fo treaw to reinu abus(cee ehs dsnee ot veslisod reh sleuot ni tnohe,!)gsmi ofr rhe obodl ot tays eth ames so,imltoyal esh stum lrcaeep the tewar hes lsot hstu ,stum at mi,nimmu rkdin 2 tsirle fo waetr per ady.

jean_young2019  great explanation!Thank you! +  



 +18  upvote downvote
submitted by cantaloupe5(68),
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S’hse igtnkani 540 mOms erp ady os seh dnees ot eetxrec 405 sOmm rpe dya ot namiitna u.eiqlbiuimr Yuo ’cnta tsju eertxce m’Omss yb mlevshstee -- ythe evah ot eb edsvlsdio ni oesm atounm of .wetar

se’tL say ouy etcrxee 450 msmO hiwt 500 mL of tearw -- ttha ensam ruyo ksiedny era inongrtatccen uiner ot:

540 smOm ÷ 050 mL = 900 Lsmm/O

tuB hte imamxmu shti a’ydls disekny cna crctaoneten iuenr ot si 504 LmO,s/m os esh ahs to eceetrx oemr warte to teg ti thta .ludtie taTh utanmo of atwer si 1 L, eceasbu 504 mO1ms/ L = 540 LOm.ms/

Nwo et’erhs hnonigt onppitsg reh ofrm tircegxne teh 054 Ommss in na nvee rome ltieud eunri -- ofr eameplx if esh knrda na texra L of tawre neo a,dy hte dysikne odcul teg rid fo tath treax L twhi het maes mnaout fo 450 Osmm by dtguilni teh ineur ot 540 mmOs ÷ 2 L = 225 /msmLO. tBu the nuoqitse ksas fro eht mimiunm mauotn of awrte -- iwchh is 1 L by the nisekdy (+ 1 L mfro eth rtohe ftsuf rfo a tlaot fo 2 L.)




 +10  upvote downvote
submitted by burningmoon(11),

Water(1) 1Kg water=1L water 450mOsm/kg water=450mOsm/L water Min H2O needed to dissolve 450 solute by kidney is 1L water Water(2) Other (feces et al.)=1L Total: water(1)+ water(2)=2L




 +8  upvote downvote
submitted by yotsubato(778),
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hsiT oiqtnesu si p.uitsd teraW eiatkn fro a aehhtyl ialduvdiin si 2.0 L a dya.




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oT ainmnait apmals oatisloylm g;t-& deNe ot ltaecyx eprleca lal hte uifsld lsot ni eht ayd

eSh cnntoa rnccetateno erniu ebaov 045 g/kmmOs , os eht mnumimi umnaot of taewr iqrredue ot eb certdeex by eiynskd is 1 t(o teecxer teh 504 Omsm esh caalueumtcs per a.)dy ehT iminmmu ictexreno tarwe deuriqre is syscienaerl ta xam conirtcnant;oe if oyu erwe ot say dupecro ruldite eiunr, ays O5msm2/,kg2 hsit duwol euieqrr 2 L of e.awrt eTh toinuqse twsan teh muminim eoilpssb ewrta emulv,o so we uamses ’hess tgtriconanecn to het xa.m

1 L lsesos mfro kdyien + 009 mL slbnieinse + 100 Lm ni atsew nad cfees = L2 sseosl ;t&-g eend to tgnsie 2 L fo aetrw ot ecerp.al

jesusisking  So helpful, thank you! +