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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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rFist noitP : ymphL sofrm at eht rplyliaaC lleve fo blodo evlssse ( as shit si wrehe diufl smevo ni adn otu of evslsse lanog hwti smiebtatelo dna nnristetu ) .

The ftcuonni fo plmyh is ot rtrnue ecssxe orpnties nad ittentlirais udfil bkac ot the ordemtsbloa ( aeclRl mLhyp uyvtnaelel sdrain iotn the ergla ines)v

ecdSon iPton : eW aym raieescn yhmpl hieetr yb isnagrceni .1 het atre at hwchi ew frmo ti . 2. Dencaeirgs teh arte fo adarigen ( i.e - rnbtictosug mhlpy lssseve )

oT neaecirs lphmy ainorfomt ew vaeh ot seariecn het raet at hciwh idflu sfetirl tou of the cliraapiels . hsiT cna eb ndeo yb itelngar isntglarS scofer ni eht lpiraclya

  • nIancesgir iaodshtycrt srpseure
  • egreaDicsn tnoOcic rpuseesr

ogGin rhuohgt eth itosnop
tno Opi A : ndloiEtneh wlli sueca soivnttsciocnroa of uaPrynolm rrayte si.hT is yaceprllraip agmienn ew wlil avhe ssle lbd/oo ifdul gintget ot het liecaalispr - ecasrddee ahrtscyotdi prseruse dna aersddece lpmyh ofiarmnot
notipO B : nCortsicotni fo mrayolnup arryte aigna
to iOnp C nda D : dale to hte hgylcipioso sernepso fo hcpxyio oosiavsnccirtton
oin tOp E : Irnecdeas ncoitco erspusre ersseecad the atonmu fo fdilu givmno otu fo sclprelaaii

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lovebug  own I ea!~dnn~usr!dt THX :) +2
limberry  I iebevle uoy eman i"ntpoO F: Inecrdsae ontccoi rupresse eesersacd het tnuamo fo diflu mvngoi tou fo alciepls"ria ateisnd fo Ontpoi ,E righ?t +3
weirdmed51  Yse . bminulA aka doco.ill +



 +18  upvote downvote
submitted by hayayah(1212)
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phmyL wflo tera si yuulals owl. tI is lenuedfcni ylrrimpia yb het raet fo pmyhl om.nfirato roF al,mepex fi obdol rlyipaacl upseersr si nriaecdse by rirlaaet adlvootaiins or onsuev cntiosicront, eht owfl etar fo lyphm ce.rsisean soA,l het folw arte is etafdfec yb oprnssimeoc fo htyaslpicm by noocncritat fo inobehggrin tmeaculrsuu nad by eneavgit iahtoctrricna rurepsse g(ha)trin.eb

atntsIerliit rsusrpee o(s preuerss in het FCE, hchwi uldwo reicsaen fi gevin IV eiasn)l nda ymhpl fowl aer pioeyvtlsi redlat.e A amlls aesrnice ni ntrlititeias meuvlo yetgrla nisaeesrc its pes,srreu ogmtrnopi hypml lofw that cats ot esrtore het ilnitsarttei umevol ot ranlo.m

eomr no htis :opcit 4gwbh/o:hnBp//m..lswwti..3ivt84/soo/kKn5Nncb

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linwanrun1357  Do nto dsnutaendr eht tnreagihb cce(ohi C and taDhe) rb ni and otu aer rdnffitee? +
khanhluong  I 'tond nowk fi ti's rtccreo or ton tbu who I dacarpopeh C ;apm& D asw ahtt yeth hotb caeus tnasoiisronoctvc ni hte ieleartosr ebe(usac hsit si the unlg wrehe yaiohxp uaessc iosvnnrct)itaosoc, hhiwc ecssaeerd shdotycrati esseprru rhtuhog hte ecallarspii nda elyueantlv erssdeace mphly .lowf yMabe I mtelyoelcp tog shti nutiesqo girth ofr gonwr aerns,o tub I tfel atth it osrkw hwit lla fo the sewa.srn F or )F I aws nikhingt ttha it oulwd seacu snarediec paalyricl coconti uprsrsee wihhc usscea rmeo fuldi ot go iont the airlyaplc nhta onti hte phmly eel.s..svs rsH'ee a rtepcu:i /-1iyaoohw09w/scch.set0n1m.p//ldngtLe2dgb:ftolmaphi/ptypu/c/twolaemp.mw +5



 +8  upvote downvote
submitted by drdoom(1206)
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rncaotoisVtcnios iwrgoan(rn of a b)uet ilwl cuesa teh fowl taer to reicneas ugrhtoh atht tbeu, iwhch aeeerdcss ourtalrdia/wda ue.psrrse eTh arefts a lfdui eovsm hhugrto a teb,u teh ssle ”owrdtau“ eocfr it ere.tsx si(Th si nknow as teh uritVen cfefte.)

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hungrybox  ont giesen owh sith si rnlaveet +9
sympathetikey  esH' oghsiwn owh A & B rea rcrecitno gbyo@runxh +7
nerdstewiegriffin  htaw a mrono @obuhygrxn is !! +2
leaf_house  TCAM lsfkbahsca on htis mieag +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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20% nmalubi si cYEtnioPRH and eucssa dwinarg of ildfu tuo fo eht mniieursttt nad tnio eth .dolbo

Abliu"mn u)(Hman 0%2 si atnedicid ni teh eecmngrye taetnmrte of omyiaepholv thwi ro htotuiw ohsck. stI feecsteefvnis ni veerisrng pmhoyliaevo ddnsepe rlaegyl upon sit ablytii to rawd tlanrsteiiit ifudl itno eht iclruintcoa. It si ostm citefevef in ntatepis owh rea lwle rhyt.daed hnWe oldob uevlom fdteiic is het utesrl fo rrmao,hgehe maelbpctoi dre boldo llcse ro lwhoe oldob sluhdo be nrmdsiiatede as cqkiuly as es"polisb.

//atu.2bmuhwmpcwir/.pdmn-sraohnlglwsmh-0utto.:/

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 +5  upvote downvote
submitted by assoplasty(108)
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noasintirtoccoVs cedsesrae dobol ofwl dan tshu dcsaerese ortiyhdscta uprsrs.ee smeSe cnuorte ntiviiuet tbu I hda ot okol tshi pu freta I otg it nogwr, oot.

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 +0  upvote downvote
submitted by bgreen27(6)
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Cna osenemo ehlp a othberr tou? yM hiknntgi wsa atth dnisraeec dfiul in hte iaetrltitisn eslad to caeidrnse lm,hyp os I htugtoh hyet ewre oioklng fro tnmseoigh to eamtuliss ghih tatulide nyrmluaop aemde ro aaertril apyomrunl HNT, ihcwh I am prytte rues tobh lade ot lanpmuroy meae.d erheW idd I og o?ngwr

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ali_hassan  hsti imtgh eb sdutip ubt i tgo ti grhti tiwh shit ot enecls:aeaiainrr a""mlron diful (09.% anseli) ni obyd = nseeiacr mlyhp .lfow obltalyues on eialmdc cepcnto ot ti, tjus glcio lol +



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