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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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riFts niPto : pyhmL omfrs ta hte aypairlCl lvlee of oobdl vsselse ( as isth is erewh iflud vemso ni dna out of evssles oangl htiw eiamtsbetlo dan rntiutesn ) .

Teh nincoftu fo lphmy is to enturr esexcs nertsiop dna iielnttrtias fiuld kcba ot the olsamobtred ( leaclR hLpmy leevntulya srnaid ntio eht arelg )vinse

edonSc inPto : We amy aeniresc yhlpm eehrti by gisicnarne 1. hte erat ta hwihc ew mofr ti . 2. sgDeearnic hte aetr fo ednigraa ( ie. - giuscotntbr hpylm seslsve )

To nseicrea yhlmp aortniofm we hvea to enraeics teh raet at chhiw diulf relisft otu fo het piciallrase . sTih nca be odne yb entlrgia iSnlagtsr fcreso in the carlaipyl

  • eagInsnric rcshttaidoy rsueresp
  • Diseearngc tcciOno eesursrp

Ggoin guhorht the sioopnt
tiOo pn A : oenntEhdli wlil uacse tinasvrtisocncoo of almoyPrun reryat Thi.s si paaerryllpci niangem ew lwli vhea less dol/ob lfdiu ggetitn to teh ailpelicsar - eadeedsrc distacryhot rrseesup nda eersdaecd mlphy oinfrtaom
opOitn B : rscinoitnoCt fo lrynoumap trarey inaga
Oopnit C and D : adel to hte gsyooihpicl onrsepse of yiphoxc sitoscrcoaivotnn
onp Oti E : aIeresncd ccotnoi sepersru ssredeaec eht otmnau fo dufli nmvogi out of asarplcieli

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lovebug  won I ets~ad!unr!~nd HXT ): +2
limberry  I elivbee you nmae nOi"otp :F edncraIse tocnioc urespres asredeces hte mnaotu fo diluf gmnvoi uot fo "lapeirsical sieandt fo inoptO E, h?rtgi +3
weirdmed51  sYe . mnAbilu kaa do.liloc +



 +18  upvote downvote
submitted by hayayah(1212)
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yLphm fwol raet is uuyllsa .wol tI si neldnecifu rarpilyim by eht rate fo mplyh tinofroa.m For eplxm,ea if obodl laparlciy sesepurr si reendsiac by lirataer satialnoodvi ro ouenvs tnoi,srtciocn het wfol reat fo mlyhp .scsiaener ,osAl eth lfow reat si fedfacte by procmnoiess of aychsitmlp yb otrcancnoit fo biriognhgen mretucluuas dan yb tvaenieg ttaihnrccraio esesurrp )ergi.ahb(nt

tirteantilsI rrpsuese (so suerspre ni het ,FEC hhwic lodwu asecrine if evngi VI si)lena nda mhlyp fowl rea oeivspilty eaer.dtl A sllam cineares in satetitirlin vulemo gyetral ernisseca ist rrpess,ue optrniomg mhylp olwf htat tcas to reoerts het atntrlstieii ulevom ot mn.laor

omer on hist oi:ctp /t./lNw./bk.shbKw8omsnw53v./n/B4n:hti4ocpogi

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linwanrun1357  oD not srdtenadnu the nrtigaheb (eichoc C adn br teaDh) in dan otu ear enrtefdif? +
khanhluong  I notd' wkno if its' octercr ro ton btu woh I oephapdcar C pa;m& D saw that eyht obht sueac cosrnostinctovai ni eth eoatrilrse (auecbes hsit is eht unlg eerhw xpiyaho caeuss ivoosinn)srtacot,c wihhc cseeerdas dsoctytriha rsreupes toruhhg eht reiisaalclp and euvlleatyn ssredceae myplh olw.f Meaby I etmploelyc otg thsi tuoinseq igrht orf orgnw oar,ens tub I tlef thta it wroks hitw lal of eht aws.ersn roF F) I asw igknihtn taht it oludw ucesa ndreecais lcairylpa notoicc eusrepsr ichwh acesus eorm fdilu to go onti hte yacapirll than niot eth mhlpy sev..el.ss 'eHser a i:rtpuec s9wpibapf/1e0twdap/yLtpomm.0llc/pm.eat1t/ycdu://gochnwe.h-o2htmlgosi/wn +5



 +8  upvote downvote
submitted by drdoom(1206)
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oorcosstnciVtnai nonr(wgiar fo a te)bu iwll cuesa hte folw taer to snraecie urghoht ttah be,ut iwhch credeseas lduw/raiordtaa prsr.eesu The tsaefr a fdliu vsmeo grhthuo a bt,eu eth slse a“u”twdor recof ti xr.tese (hisT is kwnon as eht rVniteu cffete).

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hungrybox  not gseein ohw tish si entvrael +9
sympathetikey  'Hse onwighs how A ≈m B rae iecrtcnor rhyoxgnu@b +7
nerdstewiegriffin  atwh a onrmo bgrhouyx@n is !! +2
leaf_house  MACT afalchsbsk on isth gmeia +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 abiumln si tcHiPnEYoR nad esucsa wanrgid of fidul uot of hte seuimrinttt dan inot the dbo.lo

A"nmulib m()aunH 0%2 is tncaediid ni eht nremgycee nttetemar fo heovpioyaml hiwt ro uotthwi c.oskh Its esveficsetenf ni gsrrvenie avpoyilmeho edendsp yeagllr onpu tis btiaiyl ot drwa ariltsiientt dlifu noti eht lr.iccouaitn It si tmos iffcvetee in tpaenist how rae wlle e.trydahd enWh oldbo uvmleo tfdecii si teh lusetr of ehma,orrheg opbeticmal erd odlob ellsc ro welho doolb shudlo be iiadmnderets sa ikluycq as .eb"lspsoi

/2rpnmhmb.0-hmtu/wluiu:wo.odan/psh-.srcwtalmt/g

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 +5  upvote downvote
submitted by assoplasty(108)
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nstcicnstooVioar eeacressd oolbd lfow dna stuh eeascerds atrdcythosi rr.pseseu Smese rteuonc iintevuit utb I dha ot olko isht pu tfrea I ogt ti wr,nog .oto

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 +0  upvote downvote
submitted by bgreen27(6)
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aCn sneoemo lphe a breroht out? yM inghknit aws tath idresecan uifld in het arietntiltsi lsaed to radeencsi ,yphml os I hgotuth yeht reew iglnoko for onmtsiehg ot ussaeltmi hhgi udeiltta amporluny adeem ro tarrleai arnuopmyl NH,T ihwhc I ma yrtetp seur othb adle ot yapmnorul dmeae. eeWhr idd I go nrogw?

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ali_hassan  tihs tmhig eb udspti but i tgo ti tirhg iwth shti ar:eii artcaensnole "a"mnorl dfilu 09%(. eni)asl in yodb = escienar lhmyp wlf.o tbulosaely on mlcaeid cptenoc ot t,i ujts cigol llo +



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