Kusukela ngesikhathi sokuvuthwa kweqanda, iqanda lihamba lisuka e-follicle yama-ovari, ukusuka lapho liphuma khona, ukuya emgodini wesibindi. Endaweni lapho amaqanda ashiya khona i-ovary, umzimba ophuzi uhlala, ohlinzeka ukulungiselela i-endometrium yesibeletho sesigaba sesibili somjikelezo kanye nokunamathiselwa kweqanda elikhuliswe. Futhi lapho kuqala ukukhulelwa, ikhiqiza i-progesterone, edingekayo kuze kube amasonto angama-16 okukhulelwa, kuze kube yilapho umsebenzi womzimba ophuzi uthatha kwi-placenta.
Futhi iqanda lidlula emgodini wesisu, lifakwe yi-fimbria ye-tube ye-uterine futhi lihamba eduze kwe-lumen yalo esibelethweni. Engxenyeni engezansi ye-tube, ingahlangana ne-spermatozoon, ukukhulelwa kwenzeka ngokubunjwa kwe-zygote.
Ezinsukwini ezimbalwa i-zygote ihlukaniswe, futhi i-blastocyst, enezinhlobo ezimbili zamaseli, ifika esibelethweni ngosuku lwesithupha ngemuva kokukhulelwe.
Ingqimba yangaphakathi yamaseli noma i-embryoblast yilapho i-embryo izokwakhiwa khona, futhi ungqimba lwangaphandle yi-trophoblast eyokhipha izibungu kanye ne-placenta. Nguye ozoba nomthwalo wemfanelo wokufaka umbungu emgodini wesibeletho.
Izimpawu zokunamathiswa kombungu embelethweni
I-endometrium yesibeletho ekuqaleni kokukhulelwa isilungele ukunamathisela i-blastocysts - ihlanganisa i-lipids ne-glycogen, ilulahla intuthuko yayo. Isikhathi esiphezulu sokunamathisela embryo esibelethweni yizinsuku eziyi-8-14 kusukela ekuqaleni kokuvuthwa. Ngesikhathi sokunamathela, i-endometrium iba yindawo edolobheni futhi ibonakaliswe yi-trophoblast engena kuyo (isenzo esithatha isinqumo esisodwa). Ngenxa yalokhu umonakalo, ngisho nokuphuma ngokweqile kungenzeka. Ngakho-ke, lapho umbungu unamathele esibelethweni,
Ezinye izibonakaliso ezinokwenzeka zokubambelela embryo esibelethweni yizinhlungu ezincane zokudonsa esiswini esingaphansi, ukwanda komshini wokushisa komzimba kuya kuma-37-37.9 degrees (kodwa akukho mkhakha ophakeme kunama-38). Ukubuthakathaka okujwayelekile, ukucasula, ukukhathala, ukuzwa noma ukukhipha esibelethweni nakho kungenzeka. Imizwa yowesifazane ngesikhathi sokunamathiswa kombungu esibelethweni kufana nalabo ngaphambi kwenyanga, kodwa ngosuku olulandelayo ukufakelwa kombungu egazini kuzovela i-griadotropin ye-chorionic, futhi ukuhlolwa kokukhulelwa kuqala ukubonisa ukuthi ngeke kube khona njalo ngenyanga, kanti isibeletho sikhula umbungu.