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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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rtsiF oniPt : yhLpm somrf at the Cylaalirp eelvl of oblod esevssl ( sa shti is ewhre fdliu movse ni nad tou of ssvesel ngoal tiwh ltoetsmiabe dna rtnetinus ) .

The utnonfic of myhlp si to nrtrue seescx ropstnei adn iliasteittrn ilfdu cakb ot hte doselbtroam ( ellRca mpyhL nlevaytuel ndrais otin the gaerl vni)es

noecSd notPi : eW yam sceriean hmpyl ireteh by nrsiiacgne .1 hte erta ta hiwch we ofrm it . .2 egDrceisan eht trae fo raegdani ( i.e - utgbsitcrno mlyhp ssleevs )

oT iecrsnae mphyl ooanitfmr ew eavh ot naeicesr the etar ta hichw uidlf ifestrl out fo the relaapiilcs . Tsih nac eb oned by rntgleia Srgnlsiat screfo ni het yarpilacl

  • Icsgeirnna oastyrdhcti rsuseper
  • niDcergsea cnOcoti reseuspr

oGing rohuthg eht ntposio
Oito np A : dteloEnnih llwi sacue oricaiscvonntots of anmrPouly yerart .ihTs si apraclpiyelr inmnega ew wlli eavh slse odlbo/ ifuld nttggei ot the clleipaaisr - decaredse atsirytchdo uepsrrse dan csdradeee mlhpy roinoftma
intOpo B : ortCosintnic of yrmalnpou ryetra ianga
npiOto C dna D : aeld to eth ylpihocsogi onepessr fo ioxpchy csiotronastnvcio
nOito p E : escrIdane itconco prresues rceeeassd hte anoutm of duilf onvmig tou of iescilaaprl

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lovebug  onw I etn!dn~!asrdu~ TXH ): +2
limberry  I veilebe you nmae nipoOt" F: Iescanred cintcoo eerrspsu aresdesec teh tmnoua fo liufd oingvm uot fo rlaaeilpsi"c teiasdn fo itnpoO E, hrtg?i +3
weirdmed51  eYs . Anmuilb kaa il.docol +


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 +18  upvote downvote
submitted by hayayah(1212)
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mhpLy owlf rtae si ullayus wo.l tI is ncifuedlne rrpalimyi by eht tera fo hymlp ro.oafimtn orF empexla, if lbood apyiclral rpeurses si srncaeedi by alterrai iivnodoltsaa or vsoenu tton,sciorcin the lofw reat of pmhyl srsna.ecie ,lAso teh wlfo tera is afeetcdf yb onicmoprsse fo mhyslicpta yb aonntrcoitc fo geborhgniin rmuusactelu dan yb ngiteeva ircnohraactti srreuesp gaet.(rih)bn

inIsrtetilta resurpes s(o reseusrp ni het FC,E cwihh duowl aescrien if gienv VI e)ailsn dan hplmy lwfo aer pleiviysto leedar.t A amsll niaecrse ni ltsniitetari ulevmo aregtly acnseeris its ruree,sps topnogmir pylmh wolf atht cast to teroser hte inrtltaiiset elmuvo to mrn.loa

mero no this :iptoc k3//wlbcNh:8n4bhm4o/i//tst.nv5Bw..p.Knsoigwo

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linwanrun1357  oD ont nunersaddt eth nieatgbrh eoci(hc C dan h eDarbt) in dan out rae nifrfet?de +
khanhluong  I d'otn knwo if sit' crorcte or otn tbu who I daecapproh C a&;pm D was ttah hety bhto acues ranocoistnivosct in the stlioerera ecu(sbea hist si teh nlgu rehwe hpxyaoi aseucs ,nsnccioiootav)srt ihhcw daseescer iatthyorscd serrpues roghhtu eth ciasllraipe nad tvuaellyen ssecaeder lyhpm wo.lf bMeya I tcleloeypm gto tihs eqtnsoui hgitr for wngor aeno,sr utb I tfel tath it rksow ihtw lal fo eth awsn.ers F ro F) I aws iigktnhn tath ti uowld cesua cdiraesne apcrlyila onocict sperruse ihchw ueassc omre uldif to og iton hte yacrpiall anht onit het mhlyp v.elss.e.s e' Hres a etpciu:r igleaoioammpw/s///mp0a.bnpyts/tn0/plotwpe9lLueh.2cmhy1fgc:-o1w/wtdctd.h +5


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 +8  upvote downvote
submitted by drdoom(1206)
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otosncostVacinir (nriwonarg of a b)etu llwi usaec the olwf taer ot iecsnera rghuhto that bue,t ihhwc ecesrades rdawudoat/ilra seprrsu.e eTh estrfa a dfiul msove grohtuh a ,beut hte elss wtadr”ou“ ofrce ti reest.x hsiT( si onnwk sa teh tureniV cefetf.)

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hungrybox  otn egesni hwo ihts si eelntavr +9
sympathetikey  'seH isoghnw ohw A map&; B era rtcenorci rohy@bgnxu +7
nerdstewiegriffin  what a omonr ynou@gbrhx is !! +2
leaf_house  AMCT acslkshbfa no itsh ameig +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% umabiln is cntioRPYEH nda usecas wgdarin fo fidlu uto fo het sreiutitmtn and tnoi eht b.dloo

lm"ubiAn n)uaHm( 20% si ntiddaiec in hte mgecneeyr enrtmetat fo loeaimvoyph iwht ro othwuti ckohs. Its stenicvfeeesf ni gvseinerr aymlioepovh npdesde greylla opun its ytliabi ot darw ralsiiettnit dufil onit eth lionuca.rcti It is otsm tfeifvece ni aittsenp how ear well d.atdhyre hWne bdool velmou fictdei is teh tslrue fo hhgma,oerre eplaoibtmc rde dloob lecls or hwleo lodob shloud eb iidstemardne as ikyuqcl as "s.lbopsie

t-/trso-tluammmwpichnnu/.bmhlwhws/2uogpa.d/r.:0

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 +5  upvote downvote
submitted by assoplasty(108)
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iVnssirtocooctna eascrsede oobdl fwol dan hsut ecseserda tcsothraydi psurs.ere emesS ctneruo itutvniie but I had to oklo hist pu tefar I tgo it ,ognrw o.to

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 +0  upvote downvote
submitted by bgreen27(6)
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nCa enmoeos ehpl a robrhte ?uto yM nngiikth swa atth dinaecrse ilduf ni teh snaielititrt aedls ot nsradeeic mylp,h os I outghht tehy reew ilnogko ofr somigneht ot miltsause ighh deutilat ymroupnal dmaee or alrteria orampnyul NT,H ihwhc I ma eprtyt suer hbot ldae ot rupamylon ed.mea herWe ddi I go ro?gwn

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ali_hassan  hist ghimt eb dputsi but i tog it rithg wiht isth rrieo aiatclee:sann "l"nmora udifl (0.%9 sl)enai ni oybd = sieacern hylmp lf.wo ytuollabse on dmileac cnteocp to ,ti jstu glico oll +


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