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Retired NBME 21 Answers

nbme21/Block 4/Question#23 (reveal difficulty score)
An investigator is studying the regulation of ...
Intravenous infusion of 0.9% saline for 5 minutes 🔍 / 📺 / 🌳 / 📖
tags: immuno Saline Lymphatic

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 +23  upvote downvote
submitted by andro(269)
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Fsirt ontiP : pLmhy msfor at eth arlilapCy level of lodbo lsvssee ( sa ihts is rwehe dlifu meovs ni dna otu fo slesves lnago wthi lotaestimeb dan tsnreintu ) .

Teh ntunoicf fo lmyhp is ot nerrtu cxsese isrptoen dna isrietnitatl iludf bcak to eth ltdamosoreb ( Racell hLpym eaeltvnuyl adrsin toin teh aegrl iev)sn

Soedcn toniP : eW yam rscaiene lyhpm ehriet by ncniagseri .1 the erta ta whihc we fmor it . 2. Dgscnriaee eht rate fo naaidger ( e.i - iurbtngctos lmpyh seslsve )

To ricaeens yhpml ioonmrfat ew hvea to sreicaen hte eart ta iwhch dlifu fritels uto of hte allipeicars . sTih anc be dnoe by latngrei tinrgSals csroef ni teh aciapllry

  • sgIarnceni tacirotysdh prersesu
  • ganiesDerc ioctOcn seerpsru

goinG grhutoh teh nspioto
nio ptO A : nidnlhteoE lilw aucse traivnsnoscotoic of oymnlurPa atrrey ih.Ts is lplypcaraire aengnim ew llwi heav ssle /loodb liudf ttignge ot eth ailealcspir - eseaeddrc itroytdasch seurreps adn edeersadc lhpmy ontoifram
noOipt B : Crsctnotinoi fo nlapmuory areyrt ginaa
no Oipt C and D : aled ot teh siiyopoghlc sporense fo hcoxipy ctciovstoinosanr
o iOpnt E : rceedsaIn otcoinc srsrpeue dessrcaee teh mntoua fo dlufi ongmiv tou of pellcsairai

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lovebug  won I n!!~~duratndse XHT :) +2
limberry  I ileebev uoy emna "pioOtn :F anersdIec cocitno ssrpeeur eedsesarc het unoamt of uidfl onvigm out of esialcpial"r asendti of tpionO E, trh?ig +3
weirdmed51  sYe . bAinuml aak li.oolcd +



 +18  upvote downvote
submitted by hayayah(1212)
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ypmLh flwo trea is slauluy .wlo tI si fuclenidne rrilmiayp by the rtea of lymph rniotom.fa For mpeal,xe if oodbl aclrpliay psseerur si serecidna by arailert tioildnaoasv or nvsueo ,tircosninotc eth wlfo arte fo pmlhy reiac.sens losA, hte owfl aert is faecefdt yb nsopoercmsi of hpaytlcsmi yb nttorcaonic of gohebiinnrg urctmluusae and yb givetean actcrhnoriait erssreup g(irnt).aehb

irtltaesInti rrepseus o(s uerressp in the E,FC ichhw uwdlo naeirecs fi gvien VI )lasnie dan yplmh lfow aer iyloeitvps .aeletrd A lalms neisrcae ni irtstnliiaet louvem yrgeatl sceraisen ist seprur,es pormntigo myplh olwf atht atsc ot ereotsr eth iitnttarslei mlvuoe ot olmna.r

omre on iths to:cip K.wc..3ho/bBkl/oh45n8s/vb/miwi4gwn/nspo:.Ntt

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linwanrun1357  oD tno udeannsdtr eth anhtgireb (hiocce C and e)hatrDb in nda tou rae ftdrien?ef +
khanhluong  I ot'dn konw if 'sti ctorrec ro ton tbu ohw I eacaohrppd C ;pa&m D was atth yeht htob aescu aoictcssitnvnoor ni eth ilaoererst ecbasu(e hist si eht lugn erweh yoaiphx eucsas ntoscsot)nivriaoc, cihwh rdecaeses hdtsircatyo sprreseu tghrhuo the iparsllaeic dan elteuynavl eseadserc mpyhl o.fwl yabeM I electloypm gto itsh iqtueons tihgr rfo ngowr sor,nae ubt I eflt atth it wskro wiht all of het .reawssn o rF )F I asw ghtninik htta ti louwd uasec ineadsrce apacyirll tcconio pesresur chiwh ucseas eomr ulfid ot go iotn het riycaalpl htna otni eht mhypl ..vs.eslse ' Herse a c:tpireu sino1t0/tw.phmhgaum..owe9d/l0cclaabm/poet:iysnpyld/1o/epgwmw/cLp/ftt-2h +5



 +8  upvote downvote
submitted by drdoom(1206)
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cossncnrtitiaVoo w(nngrorai fo a eb)ut wlil escau hte flwo tear to siceeanr hrguoth atht e,ubt ihhcw sdeceraes w/auradoaridtl rs.eerpus eTh aefstr a udfli mevos hthugro a et,bu eht sesl rtoau”wd“ efcor it er.tsex Th(is is ownnk sa eth nViture tceeff).

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hungrybox  tno giseen hwo itsh si earvletn +9
sympathetikey  sH'e ogshiwn who A p;am& B era rcinorect ngbh@youxr +7
nerdstewiegriffin  tahw a omnor hougr@ybxn is !! +2
leaf_house  CMAT saskbcaflh no stih egima +1

I think the more correct explanation is that lymph mostly is hyrdostatically pressed out of the thinner walled small arterioles, capillaries, venules

If you vasoconstricted the pulmonary arteriole, youd get hydrostatic backup but not into the smaller arteries, capillaries, veinules but actually less flow (due to constriction) and less lymph formation.



 +6  upvote downvote
submitted by d_holles(218)
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%02 ubimanl is cPHinRtEoY dan ucssea gdwrnai of ufild otu of eht tttsiiernmu nad iotn hte .lbodo

"lAubinm n)ma(Hu 20% is dcaidteni ni eth eymrneegc tetnratme fo hmevoyilpao hwti ro ohwttui k.hsco tIs vssfetcfneeei ni nviegresr oyipaohvlem nddsepe allreyg upon tis ytbilai ot dwra snteaiirttil iudlf tnoi eht uncitra.loci tI is tmos fveitfcee in testapin owh aer lelw rthe.dady ehnW oodlb ueomlv eftcdii si teh lterus fo rheamhoegr, tbcopalemi rde bdloo escll or ehwol ldboo uodhsl be teiesnramidd as qucliky sa .esspblo"i

w-p.thuut:-taipsmdh2nc/0.shbog.lmrnmr//wloa/uwm

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 +5  upvote downvote
submitted by assoplasty(108)
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iVnoaosnotsccrti edcrssaee dolob olfw dna hsut csreaeesd isrctyhodat surepe.rs eeSsm nturceo vteiutnii btu I had to okol hsti up atfre I got ti wrog,n too.

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 +0  upvote downvote
submitted by bgreen27(6)
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nCa eosnmeo plhe a hetbrro ?tou yM gkinhtni saw htta anederisc ifdul in eth natiietrislt laeds to nraeicesd hplym, so I httuohg they wree ilgonok fro ostiemngh ot alsisutme hhig dtultiea muyrnaolp emade ro eirlarta nporymlau NH,T chiwh I am yrptte reus thob aled to rnpoamluy d.emea erWhe idd I go gw?rno

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ali_hassan  tshi hgimt be stuipd tbu i tgo it ghrti iwht shit aretrs iie:eaaclonn nr"o"alm ifdul (%90. isne)la ni odyb = enriasce mpyhl .lofw ltbsealuyo on deimcla cctnoep ot ,ti juts iclog llo +



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