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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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--tckha-h-ofdwi-p-poawem-/wsyamvtihgzosorsna-shtao/olrliui/tyre--:opo/izapasmeomteyt.anpttl-ahcaospowqitol/dg-a

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utap2001  iNce, a inbrllati e!uitrpc +


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 +9  upvote downvote
submitted by โˆ—sinforslide(63)
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irevOvwe of iaSlav :crdtioponu

  1. iacnrA lcles stereec iltinai lvisa,a hichw si nsotiico to mapsla.
  2. lDucat slelc imdyof ainiilt avl,asi cusgian bstanporieor fo +a,N -lC and irentcseo of +K and .OH-C &;gt- ghehir +K nad HOC- nenotccrat,iosn eowlr +Na -lC coenoctinrasnt ni avlisa. In htis csepsr,o EMOR CNla is barb,edoesr aiemnng ahtt ailavs dens pu eibgn tonchopiy to slpa.ma

ctlDua rsonibeotrpa cosesrp is dnhdriee in oiwl-hfgh ,stsate wchih aessuc icnosoit lisvaa

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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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avSrlyia eentrscoi 1 . At wol lwof = ihHg ecnainorntcot of mtusiasop; lwo nnarnectotsico of i,muosd ai,brbc map;& ch dr2io.el ta hhig wolf = wlo tanictrconeno fo poimusta;s ighh nsnoetcainotrc of miosu,d ci,brba pm&;a hldciero

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sherry  'Tthas xcealyt awht I asw nkthiign ehwn I swa kiagtn eht ett.s utB I swa eidrtdackes yb amse 3HOC el.elv aCn oyobmsed nxpeali hits arpt to m?e? +
smc213  e ysh@rrctsopamst.etf.awpai~s%bvlilwercyfitini0meiaseeo/t/h:c/oe/rkmc.tsberwieu.0t2/rnpaepc/nvts2h% +2
charcot_bouchard  uacBsee ilraysav ctud soveerm Na &a;pm lC hewil seetrec K am;&p c3oH ni umenl. In wlo flow tare HOC3 m;p&a K nic cbesaeu dutc is gdion sti gniht rof oerm t.mie tA ihhg olfw aert K lsyilhgt dce (as cant eb ertcesd as m)huc but HOC3 sstya aostml ase.m the saerno is ghhi fwlo aitecdsni eghrih mmsietlbao p&;ma erghhi acibrb dptc.roiuno +
cienfuegos  gdrnRigae eth ciarbb va(i RBS liogPso,yhy hiwhc anipxlse wofl rate sa nigomc dnwo ot c"ctaton "etmi heewr slwo lowf wlasol moer arenbsoprtoi of C:aNl) The lyno noi tath osde nto itfโ€œโ€ tish noctcat itme xipoatnelna si ;โˆ’OCH3 Hโˆ’O3C nteoeiscr si elseetvicyl liestmatud hewn laavsi icrnsotee si liteamtd.us +3


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 +2  upvote downvote
submitted by โˆ—chandlerbas(118)
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tP 1 aek(ts icctri ca)id

Pt 2 satke( cya)dn

Pt 1 (2x iasavl = ihgh folw ta,er aCl2xN avrrnleit[e - ne]go)ir

Pt 2 x(1 liasav = lwo olfw etr,a LNaC1x noig[re ont ipm)]

1Pt = iictcr cdai i*smt dtcual clle ot ceetres aunlrcrelalti uladtc soretag of bcbira. rbbiac tulzareines rticic idca. usth wol a.brcib

2tP = lwo lowf ra,te thsu moer bbiacr oabedebrrs tuo of tud.c htus olw abrcbi

why do hyet hvae the smea icba,rb ebcasue lwo lfwo tr.ea

iva* cAh angils otrscdnuiatn to resainec arulcllientar cautdl mciaulc leeears g--&;t 3OCH rsoted dsenii cdltau lelc

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 +1  upvote downvote
submitted by โˆ—stepwarrior(29)
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all fnei and yndad ceetpx aitbornceba tn'is tnctoans whit flow aret

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 +0  upvote downvote
submitted by usmledelirium(0)
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I tinhk neyrovee is isncgufo no bcBiar newh yuo cna tsju aeoprcm fowl taer dan a.CLN

ighH lfwo rtea = x2 lcNa ; amse boabLwci r wolf tare = x1 lc;Na ames aibrbc

stih oshsw thta hnwe lfwo is wos,l ouy are labe ot erbrbaos .rmoe

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