Izizathu zokuthi kungani i-placenta ibizwa ngokuthi indawo yezingane, inombolo enkulu. Lesi sitho, esivela kuphela ngesikhathi sokukhulelwa, yisimo esiyinhloko sokuthuthukiswa okujwayelekile kwe-fetus.
Indawo yengane esibelethweni
Isidumbu lapho ingane ihlala khona futhi iqhubekela phambili kuze kube sesikhathini sokuzalwa - yilokho indawo yabantwana ikhona. Yiqiniso, emithi, indawo yengane inegama elihlukile - i-placenta. Ukwakhiwa kwe-placenta kuqala kakade kusukela ngesonto lokuqala lokukhulelwa, futhi kuphelela ekupheleni kwekota yokuqala. Ngaphezu kwalokho, isitho esakhiwe ngokugcwele yilona ukuxhumana okuyinhloko phakathi kwe-fetus nomzimba womama.
Incazelo ye-placenta
Indima ye- placenta ekukhutheni kunzima ukugcizelela. Kusukela ngeviki lama-20 lokukhulelwa, lapho ukwakhiwa kwe-placenta kuphelile ngokuphelele, lo mzimba uthatha yonke imisebenzi ukuhlinzeka ingane yonke into edingekayo ekukhuleni kwayo okujwayelekile, ukuthuthukiswa nomsebenzi wokuphila. Ngakolunye uhlangothi, i-placenta inamathele esibelethweni ngosizo lwemithambo yegazi, ngakolunye uhlangothi - ngentambo yomzimba igcina uxhumano lomntwana.
Izakhiwo eziwusizo ze-placenta azikhawulelwanga kuphela umsoco wengane - isitho sinikeza nomsebenzi wokuphefumula. Kwesiteshi esisodwa kuya kufika kwengane ye-oksijeni, kwezinye izazi ze-carbonic neminye imikhiqizo eyenziwa yilezi zinyane zithathwe.
Ngaphezu kwalokho, i-placenta isebenza njengesivikelo esengeziwe. Naphezu kokuthi umama nengane yezinto eziphilayo, empeleni, iyonke into, imvelo iye yakhathalela ezinye izinyathelo zokuqapha. I-placenta isebenza njengengqinamba eqondile, evikela ingane yakho emiphumeleni eyingozi yezici zangaphandle.
Mhlawumbe akubona wonke umuntu ocacile ukuthi kungani i-placenta iyadingeka nokuthi ingavikela kanjani ingane uma isesibelethweni sikamama. Eqinisweni, kunezifo ezithathelwanayo emzimbeni womama, okungase kulimaze ingane ngezinye izikhathi, ucabange ukuthi ungumzimba wangaphandle.
Ukuphuma kwe-placenta
Indlela i-placenta ivela ngayo, inkambo ye-postpartum period owesifazane incike. Ngokuvamile i-placenta kufanele ihlukanise yona imizuzu engu-15-20 ngemva kokuzalwa kwengane, kwezinye izimo umzimba udlulela imizuzu engu-50. Uma izingcezu ze-placenta zihlala esibelethweni, ukukhishwa ngemuva kokubeletha kunqunywe ngaphambi kokuba kukhishwe esibhedlela. Ngaphandle kwalokho, izinsalela ze-placenta zizobangela izinkinga ezinkulu nokuvuvukala kwesigqila sangaphakathi sesisu.