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Retired NBME 20 Answers

nbme20/Block 4/Question#16 (reveal difficulty score)
An investigator wishes to determine the ...
Ductal ion reabsorption is more efficient at low flow rates ๐Ÿ” / ๐Ÿ“บ / ๐ŸŒณ / ๐Ÿ“–
tags: GI

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 +9  upvote downvote
submitted by โˆ—masonkingcobra(408)
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ots/anuslisrarwam-shvep-gemnhc--wgh-/pop-toamtops--malitep--:koqoideoa-ta/zyhoad/aoicolhawoazyotsrw/li.t-fipytt

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utap2001  eNic, a iirantbll tei!cupr +


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 +9  upvote downvote
submitted by โˆ—sinforslide(63)
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ivvewerO of aavliS ucrpiod:nto

  1. anrAic lcsel ectrees atniiil vial,sa hwich is nisoicot to aapsm.l
  2. cuDtla cesll yfomid tanilii isvl,aa agnsicu asorbptienor of a+,N Cl- nad ectnrieso fo K+ dna .CH-O -t;g& erghih +K and HOC- tocsitno,nancre elowr N+a lC- cooatesnicnrtn in ilasva. In isht sc,psoer OMRE NCla is esardbo,ebr ignnmae atht avlais dsen pu iebgn potonichy to apa.lsm

Dcluta otbaospiernr espcors si heeinrdd ni fhlho-wig e,tssta whhci csause iitsocon isaval

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https://www.researchgate.net/figure/Relation-between-the-concentrations-mEq-l-of-sodium-potassium-chloride-and_fig3_46598804

if you look a the figure HCO3- stays relatively constant from flow rate of 1-4

+2/- j44n(141)

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 +3  upvote downvote
submitted by โˆ—usmleuser007(464)
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lyvaiSra eintoresc .1 At wlo lofw = Hihg arctinnnoctoe of s;imuaopst low ctncnesntorioa of d,iomsu ,ibacbr ±a .eldhi rco2 at ghih ofwl = wlo ntcorcaotenin fo at;ssupoim hihg tncsoirontanec of o,imdsu ba,rcib am;&p ordhilec

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sherry  ahT'st eclatxy twah I swa ginnhtki newh I swa taknig the t.ste utB I asw iekctrsaedd by emas CO3H .ellve naC ydmosbeo lenxpia isht ratp to me?? +
smc213  rreh@yseee20cbkt/:pr/iwasnvmteer.nsyicatbp/fhaotiteittwa2ei/vheml0o~scoss.uanrc./%.tsfrp/lpice%imw +2
charcot_bouchard  seueaBc lysvaiar dctu romevse Na am&p; lC ihelw erceest K &p;ma Ho3c ni u.lenm nI wlo wflo aret HC3O ;ma&p K inc seuacbe dtuc si nidog sti ghitn ofr rmeo t.iem tA high owlf eart K giylhstl edc (sa tcna eb rdecest as u)mch but H3CO tassy atmslo .mesa eht asnoer is high flow sdtcnaiei rghihe msmleibtao &;apm ieghhr ibcbar ndci.portuo +
cienfuegos  eirgdnaRg hte riabbc a(vi BRS o,hsoglPyyi hhiwc esinpalx lwfo rtae sa omncig nowd ot otcac"nt im"et erweh wslo lwof aolslw eomr rbtnoaesripo fo :)ClaN eTh lony oni that soed tno โ€tiโ€œf ihts taocntc teim elxiapnnaot is HO3โˆ’;C Hโˆ’OC3 irseneoct is cleteyelisv ltseumitad ewhn laavsi ornteiesc is lmed.aiutst +3


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 +2  upvote downvote
submitted by โˆ—chandlerbas(118)
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tP 1 e(tkas cticri )icda

Pt 2 sa(tke cya)dn

Pt 1 2(x laasvi = ihgh lowf t,aer lCx2aN lr[eitnvaer - igrn)oe]

tP 2 x1( aavlsi = lwo lofw ra,et N1xaLC [riegno ton m])ip

1Pt = icctri iacd mts*i tdaclu elcl to etseecr lrularnciaelt utdcla retgaso of ia.crbb cabbri erientasuzl itccir acd.i sthu wlo rcba.ib

2Pt = wlo folw e,rat huts moer bbicar odasebrreb tuo fo tuc.d htsu owl cbirab

hwy od ythe vaeh the msea arbbci, ecabesu low wolf .ater

v*ia Ahc isglan aotusdrcitnn to rcaeeins rltilcualerna tcadul ccauilm selreae -&g;-t CHO3 rtesod nieids udctal ellc

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 +1  upvote downvote
submitted by โˆ—stepwarrior(29)
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lal infe adn ndday eecpxt biaanobertc si'nt cttnsona thiw flwo reat

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 +0  upvote downvote
submitted by usmledelirium(0)
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I ithkn nvyreoee si gifcouns on ciabrB nehw uyo cna tjus meaorpc lofw rtae dna CL.Na

ghHi folw raet = x2 aNcl ; esma aobLbc wri lofw reta = 1x ;alNc msea ibbrca

isht sowhs ahtt wnhe lwof si sow,l uoy aer elba to orabresb .reom

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