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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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risFt iPton : Lhymp msorf at het aCalyplir evell fo doobl vesssel ( as thsi si eerhw lduif esmov in dna tou fo vessesl nlago ihwt ttolbmeeasi nad rtntneisu ) .

ehT otuinncf of ypmhl is ot ntuerr escesx siroetnp nda rstitneliati fluid kacb to teh adosbmrolet ( acelRl pLhym eeylavtnul isnrad inot eth ealgr nvie)s

cneodS tionP : We aym reesacin lmyhp ethire yb ragneinisc 1. het taer ta hihcw we fomr it . .2 cgersieDna hte etar fo rgaeandi ( e.i - sgnttuirboc lhmyp vslsese )

oT eeacnsri myhlp tarnofiom ew have to craeeins hte aret at hcihw ldifu erifstl out of hte llprciaasei . sThi nac eb oden by inagelrt rnialsSgt oefcsr ni the cayaripll

  • rsinceangI ytdaotsirch uerssper
  • iasrenDgce ictOocn pueesrsr

ognGi ghurhto the isoptno
iO ontp A : dnthinoEle will casue inaoscorcinvtost fo nymuPralo ryreat h.Tis si relyacprpila nnegmai we iwll vahe esls /oblod diulf entgitg to eth ieiasllrcpa - ecereddsa ytistdcraoh ruepessr adn seedcedar plmhy rntaioofm
tnopOi B : tnoniscCotri of amrlpoyun earrty igaan
ipnO ot C and D : dlea ot eht shpyoicilgo soepresn of coipyhx vooisiconsrctnat
o tnpiO E : ecredaIns conciot rupeessr reeecssad the uaonmt of idufl ogmivn tou of prlaeicisla

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lovebug  nwo I asnr!nutd~d~!e TXH :) +2
limberry  I beieevl uoy aenm nopti"O :F adscInere iotoncc pesruesr ceresaesd the nuotam of fliud vmogin uto of iiall"aesrcp tseadni fo optnOi ,E ihtr?g +3
weirdmed51  sYe . Abiumnl aak dlclio.o +


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 +18  upvote downvote
submitted by hayayah(1212)
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hympL lofw etar is uaulsyl w.ol It is dnecneulfi yrmraplii by eht trae fo mhpyl naiofrt.om Fro lexpm,ea if ldoob airllpacy eperurss si nadrecsie by raritale lasdioaivont ro onuevs irisc,tctnoon teh wflo arte fo pmylh assecnei.r os,lA the owlf eatr is fefcatde yb siscmoepron of slhipcaytm yb incatontcro of eorgbiignnh rtuauselmuc adn by eevgtnai otitahircnrca urspeser a)bngth(ri.e

etltnaiIirts esersupr (os perrsues ni teh FE,C which wlduo inaserce if gevin IV nael)is dna yhlpm wolf rea eitlpsiyov lrdete.a A llsam ancsiree in iiintelstatr oulemv atlygre rcsiesena its rpeus,sre ronitmgpo mhypl lofw atht ctas to trorese the saeitttilirn ovelum to ano.rml

omer on this tpc:oi ktiKt.lvnw/Nwh./Bob:p8/hocmons5s4ig.w.4/3b/n

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linwanrun1357  oD not rnnaeudtsd eth aghntierb c(hioce C dna her)Db at ni nda out rea dnif?ftere +
khanhluong  I otn'd onkw if t'is crctero ro ont tbu how I adphrocpea C ap;&m D was ttah thye obth auces onicsrtontaicsvo in hte rlsotaerei (eucaseb sith si teh unlg rwehe oxpyhia acssue sao,ivccro)nntsoit ciwhh ercdsseea ycohtdaisrt eserrpsu otghuhr teh aieilsprcla dan ueetnlylva decsaeesr hpylm owl.f ebaMy I clmeeloypt got tihs enoqsuit gtihr for gworn roase,n but I tlef htta ti okwsr iwht all of het esnsawr. roF F) I aws knihgtin tath it lowdu aceus ecnaiders irpallcya ocnioct epussrre hwcih sausec meor fduil ot go noit hte icylplraa ahnt ntio teh ylmhp elss...sev sere'H a :tiurpce p/autfpyec0p1oeyglo:ol/wamd9shw2.sc/.h/d0ntbtc/1i/ilwwtmtnpa/Lge.p-ohmm +5


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 +8  upvote downvote
submitted by drdoom(1206)
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occrioannstVtios rnwoir(ang of a uetb) will cusae the olfw taer to rsceiean hhoutgr htta ,ubet hwhci edcssaree waraiatodu/rld eerr.puss ehT rsteaf a fidlu osvme utohghr a tu,be hte sles urd“awto” cfeor ti sreex.t hTs(i si onnkw sa hte uVintre cftefe).

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hungrybox  tno engsie ohw isht si vrnleeat +9
sympathetikey  'Hse hgnsoiw woh A mpa&; B rae critcnore @roxnbyugh +7
nerdstewiegriffin  wtah a mrono ynohxg@rbu si !! +2
leaf_house  MTAC skalbchafs on iths 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.


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 +6  upvote downvote
submitted by d_holles(218)
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02% nuiambl si RtYPnoicEH adn escuas rwaidng of lfdiu uot fo eth entstimirtu dan otin eht .ooldb

"lubmAin auH(mn) 0%2 is ediidatcn in the rnmeceeyg mraetntet of yeoopvmhial tihw ro twtuioh okshc. tsI sveefcienstef ni grsevrine opielmovayh edsdenp yleaglr pnuo tis iytibal to rawd iiaintsltert uldif oitn the culnticir.oa tI is osmt tecefivfe in atipents hwo aer well rhta.ydde Wehn olodb voeuml ietficd si hte ulsret of hghreemaor, lpobeicmat edr lobod ellcs ro lewoh dlobo lsuohd be dadmeetsiinr sa iuqlcyk sa .loespbi"s

a/.rn-tnruuhcpotl:hm.pwgsl/t/mws0mb2ih-umaw.d/o

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 +5  upvote downvote
submitted by assoplasty(108)
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tocVtcrionaissno seredcase olbdo oflw adn usht esaerdsec tshcydiatro ueres.srp Ssmee oenurtc neiiviutt utb I dha to look hist pu eraft I ogt it nw,org ot.o

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 +0  upvote downvote
submitted by bgreen27(6)
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aCn omsoene ehpl a robterh o?ut yM ngkthiin asw atth cardeeisn idflu in eth rienttliitas adels to saecrdine lmp,yh so I uohtthg heyt erew oilkogn fro etsihgonm ot mtilsusae ihgh udetlita mranylupo madee ro tlairrea ympalroun ,HTN hihcw I am petrty eusr htbo ldae to ruaynlpmo d.aeem erWeh idd I go ?rngwo

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ali_hassan  htsi higtm be idutsp tub i tog it ghtir wiht htis sroatn:ealierenia c ""ronalm lduif 9.0%( s)leian ni bydo = scienrea phlmy .fowl auboeyllst on aelidcm ccpeont to t,i jstu oligc oll +


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