Izizathu zokuba kutheni i-placenta kuthiwa indawo yabantwana, inani elikhulu. Eli candelo, elibonakala kuphela ngexesha lokukhulelwa, yimeko esemgangathweni yophuhliso oluqhelekileyo lomntwana.
Indawo yomntwana esibelethweni
Iqumrhu apho umntwana ehlala khona aze ahlawule ngokukhawuleza ukuya kwixesha lokuzalwa - yile nto indawo yabantwana. Enyanisweni, kwiyeza, indawo yomntwana inegama elihlukile - i-placenta. Ukuqulunqwa kwe-placenta kuqala ngokusuka kwiveki yokuqala yokukhulelwa, kwaye iphelela ekupheleni kwekota yokuqala. Ukongezelela, ilungu elizeleyo liyikhonkco ebalulekileyo phakathi komntwana kunye nomzimba womama.
I ntsi ngiselo ye placenta
Inendima ye- placenta ekukhuleleni kunzima ukugqithisa. Ukususela kwiveki ye-20 yokukhulelwa, xa ukubunjwa kwepentecenta kugqibeleleyo ngokupheleleyo, lo mzimba uthatha yonke imisebenzi ukunika umntwana konke okuyimfuneko ekukhululeni kwakhe okuqhelekileyo, uphuhliso kunye nomsebenzi wobomi. Ngakolunye uhlangothi, i-placenta ifakwe kwisibeleko ngoncedo lwemithambo yegazi, kwelinye - ngokusebenzisa intambo yomgcini igcina uxhumano lomntwana.
Iipropati ezisebenzayo ze-placenta azikhawulelwanga kuphela kwisondlo somntwana - ilungu linikeza umsebenzi wokuphefumula. Kwisitya esinye ukuya komntwana i-oxygen, kwezinye iirhasi ze-carbonic kunye neminye imveliso eyenziwa yinkwenkwe iyancitshiswa.
Ukongeza, i-placenta isebenza njengokhuseleko olongezelelweyo. Nangona kunjalo ukuba unina kunye nempilo yezingane, ngokwenene, enye inye, uhlobo luneenkathalo ezithile. I-placenta iyasebenza njengesithintelo esicacileyo, esikhusela umntwana kwimiphumo emibi yezinto zangaphandle.
Mhlawumbi akubona wonke umntu ocacileyo ukuba kutheni i-placenta iyadingeka kwaye ingayikhusela umntwana ukuba ingaba sisibeleko sikamama. Enyanisweni, kukho izigulane kumzimba womama, odla ngezinye izilimaza umntwana, ucinga ukuba ungumzimba wangaphandle.
Umphumo we-placenta
Ngendlela i-placenta ivela ngayo, ikhosi yexesha lokugqibela emva kwentsapho exhomekeke kuyo. Ngokuqhelekileyo i-placenta kufuneka ihlule ngokwawo imizuzu engama-15-20 emva kokuzalwa komntwana, ngamanye amaxesha umzimba uphupha imizuzu engama-50. Ukuba iziqhekeza zepentecenta zihlala kwisibeleko, ukukhutshwa emva kokuziswa kunqunywe ngaphambi kokukhutshwa esibhedlele. Ngaphandle koko, i-remains of placenta iya kubangela iingxaki ezinzulu kunye nokuvuvukala kwesangqa sangaphakathi sesisu.