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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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Ftirs tinPo : yhLpm fsomr at teh alCriaypl evlle fo bldoo sseslev ( as htsi is eewhr diflu mosve ni nad out of vessels lango hiwt teotismbeal nad ttrseunni ) .

ehT ntcniufo fo lpmhy is ot ntrreu sxeces ripontse adn lstniiettira fudil akbc to eth berdmaooslt ( eRlcla pmyhL vulleeanty nadsri tino hte elgra )evsin

dSnoce otPni : We amy eacesrin yhlpm hertie by nnsirgaeic .1 hte rtea at chhwi we ofmr ti . 2. enasgDrice eht aert fo gidaerna ( ei. - nsouctrbitg phylm vsslees )

To rsaeenic myhpl ritamnfoo we aveh ot rincaese hte etar at ihwch lfuid teilrfs otu fo hte psiaiacrlel . shiT nac be edon by grtiealn Srltngisa focrse in eth crypllaia

  • Iecirgsann odhriattcsy upererss
  • snergecaiD tnocOic esuesrrp

onGig hurtogh hte osptoin
npOto i A : onehtdEnli illw seuca acnnsviosiotorct fo mulnyaPro ytaerr hisT. si rapeycpilalr ainmeng we lwli veah lses blo/od idlfu ggtneit to hte caerlaisipl - dcdersaee croiyhdastt esuepsrr and rcedesdea mhlpy rofinmtao
ionptO B : osrtCnnictio fo maryunlpo eartyr aiagn
p nitOo C adn D : elad to hte cphgisiyool snreopes fo ypoihxc atctonircsoniosv
ptni oO E : edsacIern otoncic pseuesrr ardeseesc het ntouam fo fluid nvigmo otu fo sriecllapia

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lovebug  nwo I deda!unn!t~sr~ XTH :) +2
limberry  I eeeilbv uoy mane iO"opnt F: enrsacdeI cicnoto erusespr cesaderse teh mutnao fo ifdlu ingmvo tuo of arlcles"apii snetdia fo nitOop ,E g?hrti +3
weirdmed51  Yse . iAnmubl kaa d.ilocol +


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 +18  upvote downvote
submitted by hayayah(1212)
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hpLmy lfwo ater is llyusua w.ol It si diennlfuec mplraryii by eht etra fo lmyph ntaifomor. orF lexpme,a if bdolo lapiarylc rpesuser is draseicen yb arlareti vloaiidtanos or onuesv otonicstci,rn the oflw atre of mpylh scr.snaeie Asl,o eth wfol arte si edafecft by ncoersimpso fo yclphmisat yb iacottonnrc of boineighnrg mreutauculs dna by niagetve ciaictrnraoth reepsrsu .agn)rtihb(e

etnrltaitIis eespursr (os sruprsee ni teh CEF, iwchh oduwl ciaeesrn fi gievn VI lnsia)e nad hpylm wolf aer vsetipiylo tre.adel A mslla crsnaiee ni siinttrilaet oelvum lytearg snaesicer tsi pu,rsrees gonormtip phlym folw that tacs to reoetrs het inttarsieilt uvmleo ot lamo.nr

remo on shti cpio:t oh4gn/NwK53..s/./scb4woptmtvbBh8./:i/kwinlon

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linwanrun1357  Do tno ntdudrnesa eth banetighr c(hcioe C dan reD )bath ni adn uot era rnei?tdfef +
khanhluong  I odtn' nwko if 'tis ctocrre ro otn utb woh I coaraepdph C &;pma D saw thta etyh ohbt eucsa aonocsotnitrsivc ni eth terirlsoea cbeua(es hist is het gnul erhew hopyxai eusasc vritoosa,itocnc)ns hchiw asedseecr dascityorht rsreueps hhrtgou hte crpeillasai dna auyvnletle eecsderas lmphy wo.fl Mebya I llytpcemoe got hsit qeostniu thigr rfo ogrnw nase,or tub I fetl tath ti kswro hiwt lla of teh wasnes.r Fo r )F I aws iktngnhi hatt it ulwod sceau iercdanse plarcayli nticoco sreprseu hwich seusac remo iufdl to og noti eth ipyaalrlc ntha toni eht ymlph .ses.s.lve esr'He a uect:rip l.:s0thdcLpsp.thwg/iw/oba/1wtepdengp/uap1.fm/9mm0n/moyoy-ehtoilw2a/lcct +5


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 +8  upvote downvote
submitted by drdoom(1206)
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tcsciosnaVtionor w(rninroag fo a bte)u lliw ueacs eht fwlo erat ot recnesai uoghtrh tath tb,eu hwihc eecsdesra iar/orldatuawd .euersrps ehT feasrt a fidlu evmso trhough a eubt, hte slse “utra”odw fecro it xetser. hisT( si nownk as het nueiVtr ffecet).

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hungrybox  otn seineg who iths si enreltav +9
sympathetikey  es'H owhnsgi hwo A ;pm&a B era coerrnict yog@bnxhru +7
nerdstewiegriffin  ahtw a oomrn rn@oyubxgh si !! +2
leaf_house  CAMT fsbshackal on iths meiga +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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%20 bmlnaiu is tcniRoPEYH nda escusa nrgwadi of duilf out of eht stitnmieurt nad iont hte dob.ol

unb"Amli mun()Ha %20 is tineiadcd in hte eegemnrcy mtrteanet fo poaveimholy hwit ro twhouti .ohcks sIt ivfefeneetssc ni vgrrniees ehoypmliaov eddneps lyegarl oupn its ytiabil to dwar liitristtean iudfl iotn het cltacinor.iu It si tmso fefveicte ni tesapnti ohw are llwe tdeyrd.ah hneW bdolo lvuome fieicdt is the lurets of rga,eerohmh taceimlopb rde doolb sllec ro wleoh bdolo uldsoh be riamdedntsie as ulykqic sa bislso.e"p

.pa0iurwouhm2sr/mm:wmtbhspc/wthog.n-la.und-/lt/

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 +5  upvote downvote
submitted by assoplasty(108)
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iioctconsanstVro cedssreae blood fwlo and suht ssceeared trchytdsaio erprsse.u eesSm ntouecr iniveitut btu I adh to lkoo sthi pu tafer I tog ti wnorg, t.oo

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 +0  upvote downvote
submitted by bgreen27(6)
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naC osoneme lhpe a etbhrro uto? My intknhig swa atht sdrianeec ilfdu in eht etlttinsaiir ldsea ot seenairdc lhm,yp os I gtohuth tyeh reew gkniloo fro ogtnmihes to aumlstsie hhig luteidat umlanoryp edema or rlreiata rumpnylao ,HTN hichw I ma reptyt resu btoh adel ot lpoanyumr e.dmae erWeh did I og gwnro?

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ali_hassan  shit githm eb tpuisd tbu i tgo it htrig ihwt tihs c eo:anrtarleiaisen alm""orn ludfi .%9(0 )slnaei ni yodb = nsreicae hlpym wl.of ltasyoblue on caiemld tenpcco ot ,ti jtus ogcil oll +


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