Instauración y Evolución de La Circulación en El Embrion y Feto

 

@istcurcj`úi y fvlbuj`úi kf bc j`rjubcj`úi fi fb fnmr`li y dftl @itrlkujj`úi? Bc dlrncj`úi kf scikrf y vcsls scieuîifls fstc lr`fitckc kfskf fb pr`nfr nlnfitl c jlistru`r j`rju`tls j`rju` tls jfrrckls f `itfrjlifjtc `itfrjlifjtckls kls plr bl quf bc scik scikrf rf kfmf bbfcer c tlkcs bcs pcrtfs kfitr kfitrl ly dufrc kfb fnmr`li. Bc j`rjubci v`tfb`ic y bc j`rjubcj`úi cbctl`kfc pfrn`tfi bc `itfrjlifx`úi kf fitrf bls cifols fxtrcfnmr`licr`cs(scjl v`tfb`il v`tfb`il y cbcitl`kfs), y fb `itfr`lr kfb jufrpl fnmr`lcr`l7 bc j`rjubcj`úi fnmr`licr`c pfrn`tf quf bc scierf bbfeuf c tlkcs bcs pcrtfs y blr lrecils kfitrl kfb fnmr`li. Kurcitf fb kfscrrlbbl fnmr`licr`l bls trfs j`rju`tls jlfx`stfi y jlnpcrtfi fb jlrczli y bc clrtc jlnl trcyfjtls fi jlnui. Bc cpcr`j`úi kf fstls f stls crjls j`rjubctlr`ls rffoci bc h`stlr`c fvlbuvc, yc quf tlkcs bcs fspfj`fs pr`fnrli pcrjf bc j`rjubcj`úi v`tfb`ic, bufel sf `istcurc bc j`rjubcj`úi v`tfb`ici klikf sf rfnlkfbci bls vcsls pr`n`vls y jubn`ici bc dlrcnj`úi kf tlkls bls vcsls kfi`vls. . J`rjubcj`úi v`tfb`ic  v`tfb`ic  Bc j`rjubcj`úi v`tfb`ic fif pbfil s`ei`jckl jli hufvls plb`bfj`tls( cvfs y rfpbfs), fi ncnîdfrls fs trcis`tlr`c. Fi tlkcs bcs fspfj`fs, bcs pcrkfs kfb scxl v`tfb`il fs klikf sf dlrnc bc pr`nfrc scierf y vcsls scieuîifls, cuiquf fi cbeuics fspj`fs fi bcs quf fb scjl v`tfb`il sf ctrlc bc j`rjubcj`úi v`tfb`ic sf s`euf dlrncikl. Kf fstc dlrnc, sf dlrnc uic rfk kf jcp`bcrfs quf ui ãrfc v`tfb`ic juyc fxtfs`úi fs nre`ickc, fi cvfs y fqu`ils, plr uic vfic bbnckc sfil tfrn`icb, bl fxtfrnls kf bls jcp`cbcrfs vci jliuyfikl hcstc hcs tc jlist jlistu`r u`r ui pcr kf vfics vfics v` v`tfb tfb`ic `ics, s, quf sf k`r k`r`ef `efi i kfb crfc v`t v`tfbo fboic ic hcs hcstc tc fb juf jufrpl rpl fnmr`licr`l, jcmf kfstcjcr, quf bls vcsls sceuîifls quf sf k`r`efi cb jlrczli pr`n`vl sf bf jliljf jlnl vfics, cb `ierfscr sf nfzjbc jli fb rstl kfb jufpl fnmr`licr`l. Bcs jlitrcjj`lifs jcrk`cjcs bczci hcj`c fb s`tcnc fimr`licr`l7 ui pcr kf ctfr`cs v`tfb`ics crrcjic bc zlic jcukcb kf k`jhl s`stfn clrjl y ctcrvfz kfb lnmb`el lnmb`el sf k`r`efi hcj`c fb crfc v`tfb`ic y có cójcizci jcizci bls jcp`bcrfs, jfrrcikl fbj`rju`tl. Fvlbuj`úi kf bls vcsls scieuîifls Kfitrl kfb fnmr`li fstls vcsls fstci rfbcj`lickls jli fb `istfil pr`n`vl, plr bl quf bc pcrtf kf fbbls sli ub`zckls pcrc dlrncr crtfr`cs y vfics `istfsicbfs, bc fvlbuj`li kf bcs vfics v`tfb`ics fstci fst ci rfb rfbcj` cj`lic lickcs kcs c bc cpcr`j cpcr`j`úi `úi kfb sfil sfil hfnlyà hfnlyàjl jl,, fb juc jucbb prl prlv`f v`fif if kf uic ncsc kf nfsfiqu`nc fitrf fb lnmb`el y fb jlrczúi, bc vfics v`tfb`ics quf `infrscs fi fb nfsfiqu`nc fb jucb dlrnci fb duturl hîeckl, fb jucb jlistuyf c dlrncr uic cnpb`c rfk kf vfics y s`iusl`kfs hfpãjls. Lyrc pcrtf kf bcs vfics v`tfb`ics qufkci fitrf fb `itfsil y kcrci lr`efi c vfics quf rfjlefi scierf kfskf fb `itfsil( vfic nfsfitfr`jc), y bc bbfvci hcj`c fb h`eckl(vfic plrtc). N`fitrcs quf bcs vfics kfb h`eckl cb jlrczli v`fifi c dlrncr pcrtf kf bc vfic jcvc jcukcb. Bls jucbfs sli `npcrfs , c k`dfrfij`c kf bc vfics pr`n`vcs quf sli pcrfs, plr bl quf pcrj`pci fi tlkl bls trcyfjtlrfs kfb bckl kfrfjhl. Bc crtfr`cs v`tf`b`ics tcnm`fi dufrli rcncs kf bc clrtc quf fi fb jcn`il eucrkci rfbcj`úi jli fb `itfsil.

 

J`rjubj`li cbcitl`kfc Fi bcs cvfs sf `i`j`c jli bc prlerfs`vc vcsjubcr`zcj`li kfb cbcitljlr`li, fb jucb s`fnprf jlfx`stf jli bc j`rjubcj`úi v`tfb`ic, yc quf csunf duij`lifs jlnpbfnfitcr`cs. Fi bls ncn`dfrls bbfec c jlitu`r bc mcsf kf tlkl fb `itfrjcnm`l njrlfnmr`licr`l, yc quf sus vcsls sli fb lr`efi kf bc j`rjubcj`li pbcjfitcr`c. @i`j`c fi bls nÿbpbfs jcp`bcrfs kf bcs vfbblj`kckfs jlr`cbfs, kfskf klikf jliuyfi uic sfr`f kf vfic cbcitl`kfcs qu dlrnci uic rfk vfilsc fi fb i`vfb kf bc pbcjfitc. Fijcrecs kf rfjlefr bls iuritfs iuri tfs y trcisplrt trcisplrtc c lx`efil cb fnmr`li. fnmr`li. Bufel , fstf jliouitl kf vfics sf uifi pcrc dlrncr ui pcr kf vfics unm`b`jcbfs, quf sf k`r`efi cb jufrpl fnmr`licr`l plr fb `itfr`lr kfb jlrkli unm`b`jcb, kfitrl kfb fnmr`ls fstcs vfics ctrcv`fsci fb sfil hfnctlplyàjl, bc jucbfs kf s`r`efi cb jlrczli. Bc cjj`úi kfb jlrczli `npubzc bc scierf hcj`c fb s`stfnc crtfr`cb, bc jucb bbfec c tlkl fb fnmr`li , pfrl fs kfr`k`e`kc hcj`c bc pbcjfitc plr bcs crtfr`c unm`b`jcbfs, bc jubfs sf `itrlkujfi plr fb jlrkli unm`b` unm `b`jcb jcb y cbj cbjciz cizci ci bc pbcjfi pbcjfitc tc kli klikf kf sf rcn rcn`j `jc c fi ui pcr kf crt crtfr` fr`cs cs cb cbcit citl`k l`kfcs fcs,, juyls juyls fxtrfnls sf uifi jli bls jcp`bcrfs kf bcs vfbbls`kfcs, jfrrcikl fb crjl vcsjubcr. Fvlbuj`úi kf bls vcsls cbcitl`kfls Fi bls ncnîdfrls bc j`rjubcj`úi cbcitl`kfc jlistuyf bc mcsf kf bcj`rjubcj`li pbcjfitr`c, plr bl quf fs `nplrtcitf quf sf fstcm`b`sf, yc quf pfrn`tf fb `itfrjcnm`l fitrf fb fnmr`li y bc nckrf. Fi fstf prljfsl bls vcsl cbtcl`kfls sudrfi n`k`jcj`lifs, jlnl bc ctrlc bcs vfic unm`b`jcb kfrfjhc, plr bl quf duij`lic slbl bc `zqu`frkc, bc jucb fs bc ui`jc vfic quf pfiftrc fi fb f b fnmr`li. Fx`stf Fx`stfi i k` k`dfrf dfrfitf itfss fspfj` fspfj`fs fs kli klikf kf bc vfi unm`b unm`b`jc `jcbb jliuy jliuyfi fi pcrc pcrc dlr dlrncr ncr bc vfic vfic unm unm`b` `b`jcb jcb `zqu`frkc? Jcri`vlrls Jcri` vlrls y run`citfs? run`citfs? bcs kls vfics vfics sf ncifif prfsfitfs c bl bcrel kf tlkl fb jlrkl jlrkli i unm`b`jcb , yc quf bc kfrfjhc sf `ijlrplrc c cb `zqu`frkc pljl citfs kf pfiftrcr cb jufrpl fnmr`licr`l. Jcmcbbl y jfrkl? bc vfic unm`b`jcb kfrfjhc sf `ijlrplrc c bc `zqu`frkc fi fb `i`j`l kfb jlrkli unm`b`jcb. Jli bc dlrncj`li kf bcs ercikfs vfics, bc scerf quf cjcmc jlikuj`fikl bc vfic `zqu`frkc kfb jlrkli unm`b`jcb cjcmc bbfecikl cb jlrczli il k`rfjtcnfitf, s`il ctrcvfz kf bc vfic jcvc jcukcb. Qcrc fbbl fi fb hîeckl sf fstcmfbjf ui jlikujtl vfi`lsl quf trcv`fs fb hîeckl hfpãjl y jrfc uic rcp`k rcp `kc c jlnui` jlnui`jcj` jcj`úi úi fitrf fitrf bc vfi vfic c jcvc jcvc jcukcb jcukcb y bc vfi vfic c unm unm`b `b`jc `jcbb `zqu`f `zqu`frkc rkc.. Fst Fstl l fs fi bc efstcj`úi kf dftls kf run`citfs y jcri`vlrls. Fi fqu`ils kfscpcrfjf nuy prlitl plr bl quf bc scierf quf prljfkf kf bc pbcjfitc kfmfrã ctrcvfzcr tlkc bc rfk kf s`iusl`kfs y vfics kfb pcrfiqu`nc hfpãjl citfs kf kfsfnmljcr fi bc vfic jcmc pcrc bbfecr cb jlrczli.