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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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ristF nPtoi : ypLhm rsfom at hte raplialCy leevl fo bodol elvsses ( sa isht is wereh ifuld semov in dna otu fo sseeslv anolg ithw teeiasbotml nda ertntunis ) .

Teh fcuintno fo phmly si to rutern sexcse rniotspe adn iitanistlert dfiul acbk to the tooebdlrsam ( Rcelal hmyLp enlletvyua inards noit eht laerg )evsni

eonSdc ntPio : eW may acrseine yhmlp eeithr by erngiscian .1 the ater at chwih ew fmro it . 2. rcgeDniase teh aret of agarenid ( e.i - tuirtsngocb lhpmy esvsles )

oT esancier lypmh mnraiotof ew eavh ot acnieesr eht tera ta hhicw ufldi rsfeilt uot fo the lpelaiarics . hiTs cna eb oedn by gretinla nrsigltaS srfceo ni het aallycirp

  • ncIisragne aidothctrsy esurpers
  • seenrgDiac ciotnOc ursprese

Ggnio hogurth eth otsnoip
pt oniO A : ndeEhintlo wlil eaucs nitorasotnoicscv of uaoynlPmr aeyrrt Tish. si caareipyllpr nngmeai we wlil ehav esls /obold dufil igtteng to eht pilrlcaiesa - esraecded dtacrtyhsio sruersep nad aedesrdec lpmyh atifomrno
iOtnpo B : niCttroiocns fo urlamopny eytrra ganai
pio Ont C nda D : dela to hte iolpgcoysih orenspse fo phycoix osatiorscivontnc
p toinO E : scrIdneea nocotci eprssure secredase eht oantum fo duilf nvgomi uot of lapleirsica

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lovebug  won I !ds~rn!~adtneu HTX :) +2
limberry  I eveblie oyu mean inOopt" :F Ieedcnras ontcico esesuprr eraescsed eth atumno fo lfdiu vignom uto fo p"lialcaresi anitsed fo opintO ,E it?grh +3
weirdmed51  sYe . nAblmui kaa ll.docoi +



 +18  upvote downvote
submitted by hayayah(1212)
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yLhmp lowf rate si uysuall wl.o tI is iufnedlnec maiiprlry yb het aret fo hlmyp manooitf.r oFr pemxa,el if dolob acillpyar errsseup si naidrsece by rlaiaret aindsiotvloa or voneus nrscinico,tot hte ofwl ater fo hmlyp reeacnss.i Aslo, the fowl rtae si taeefcdf by snoepmcrosi fo tihplscyam yb trtianccono fo iorbenhigng ruulcasmteu nda by niteevga rrtoacntiahic spurerse ahi(grnbet).

Ialstritteni rrspeseu s(o urrpesse ni het CF,E cihwh oudwl aenersic fi ivegn VI enla)si nad hpyml flow ear oelvytiips .ldaeetr A mllas rasenice ni siarelittnit lvmuoe geltyra enseasirc its ,peusersr tpngormoi pmhly lowf that tasc ot soerert eht instiattlrie ulvmeo ot mroan.l

mero no thsi tc:poi N/o/K4.ct:nlBnk/.bgi.wsb53wtwohisopn8/hvm.4/

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linwanrun1357  Do otn srtuendand eht habiegtnr h(iceco C dna eb aDrh)t in nda tou era tre?edfinf +
khanhluong  I ndot' nkwo if i'ts ctcorre ro ont tub hwo I cadheaoprp C &p;am D asw ttha yeth both aucse nooicntsoiatrvsc ni teh oaeielrrst be(sucae itsh si eth glun eewhr opixhya asusec vn)tcsaonrsiitooc, ihchw eedsacesr rytostaihcd erspsrue uhrhogt hte aeirplaiscl dan euvyleltna scdeaseer hympl o.wlf eabMy I yptloeemlc tog this stqoeuni hitrg ofr nrowg no,arse btu I telf that it krwso htiw all of teh renw.ass Fro F) I wsa tgihnkni hatt ti lodwu ucase sinadcree alyiaclpr noioctc eesurspr wichh sseauc reom fudil ot og tnoi hte ilrpcalay hnta iotn het myhlp svss.ee.l. rseH'e a iuce:rtp htge/loiaohw0:itmyym./ptg/tawlpcd0-lon9spsfwdp2nuc/bme.Lcow1.a/ht1pm//e +5



 +8  upvote downvote
submitted by drdoom(1206)
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Vrnoonicastticso (rngwrinao of a btu)e wlil cueas het wlfo atre to esenirca urthogh taht ,beut ciwhh esesdacer /aaruddiawrtol urspse.er ehT rtaefs a dulif osvme rohguth a tu,be het slse tuawd“”ro crofe ti .extser sh(Ti is oknnw as het tuVnrie fefcet).

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hungrybox  nto seegni how ihts si eltvaren +9
sympathetikey  sH'e howsngi woh A m≈ B rea cconrerit orxghy@ubn +7
nerdstewiegriffin  ahwt a normo bnyh@orgux si !! +2
leaf_house  TMCA kbafcslhsa on tsih aemig +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 binlamu is EYPointRHc adn uscesa ndirgaw of iuldf uot of eht tiesmtnrtui dan tion eth bl.doo

ni"ulAmb (nuHm)a 0%2 si nditieadc in teh ecrmyeeng meatntret fo moieolpyhav ithw ro utothiw ck.hso sIt feviesftences in enriesrgv oympvloiaeh epnsded rleglya ounp sit byailti ot rdaw rtttsilnaiie fiudl itno eth ra.cnicoulti It is mtso evfiteefc ni anesiptt woh era lwel tyadd.reh nWhe bodlo muloev tcediif si teh lteusr of r,aoerhhmeg cpeoaitlbm red olbod elcsl ro lewoh oolbd holdus eb naedmridseti sa iqkucly as silbo"pes.

gbsthwlmur2/n/pomm.o0c/mdlw/u.ai:.ntsuawptr-hh-

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 +5  upvote downvote
submitted by assoplasty(108)
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aniVoisrtoosncct ecdeasrse bodol lfow dan htsu rcaesesde dotycihtras .perrsesu eeSms nrtecuo niieivtut but I dah ot oolk tsih up after I got it nwgr,o oot.

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 +0  upvote downvote
submitted by bgreen27(6)
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anC esemono phel a brertho uto? yM nnhgiikt aws htat iscneaedr iufld ni the tlirensatiti elsad to aricedsen hmpyl, so I ugtohht hyte eewr loigkon rof mntisgeoh ot asutsilme hhig titleuad umonplary edame or ritarale rmuploany T,HN iwhhc I am peyrtt erus tobh dela ot apoyumlrn e.edma Whree did I go wn?rog

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ali_hassan  shti mghit eb sputdi utb i gto ti gitrh htiw this r:lnora eiieasctaen "mlonra" ulfid (0.9% lase)ni ni oydb = iaerscen lmphy l.ofw uytoasebll on mcdaiel opnecct to i,t sjut clgoi lol +



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