Masinyane emva kokukhulelwa, inqubo ejulile iqala - ukuchoboza iqanda. Amaseli amabili aphenduka amane, bese eba ayisishiyagalombili, ngemva kwamasonto ambalwa abe umbungu. Sekuvele sekubekwe izitho ezisemqoka, futhi ezinyangeni ezingu-9 kuyoba yintsana esanda kuzalwa.
Iqanda lifaka isikhathi esingakanani?
Inqubo yokukhulelwa kweqanda iphela amahora ambalwa kuphela. I-spermatozoon ihamba phakathi koqweqwe lwe-epithelium, elungeze iqanda, lingena egobolondeni lalo bese lifika ku-nucleus. Ngesikhathi sokukhulelwa, i-sperm isebenzisa ama-enzyme akhethekile atholakale ekugcineni kwekhanda, okusiza ukunqoba umkhawulo wokuzivikela. Emva kwalokhu, i-ovum ayisatholakali kwezinye i-spermatozoa, i-cell division iqala.
Ukuhlukana kwama-oocyte
Ngenxa ye-fusion ye-ovum kanye nesidoda esivela kuqanda elivundisiwe, i-zygote iqala, isigaba sokuqala sokuthuthukiswa kombungu. Phakathi namahora angu-24 alandelayo, kuyoba yinto engavumelekile ukuthi izoqala kancane kancane ibe yisakhiwo esiyinkimbinkimbi. Ku-zygote, inqubo yokwakhiwa kwe-nuclei (owesilisa nowesifazane) iyaqhubeka. Ngayinye yalezi nuclei inezinhlobo zayo zama-chromosomes - owesilisa nowesifazane. Ama-nuclei akhiwa emikhawulweni ehlukene ye-zygote, akhangwa komunye nomunye, amagobolondo ahlakazeka futhi aqala ukuchoboza.
Amangqamuzana amantombazane akhiwa ngenxa yokuhlukaniswa yaba mncane, ahlala egoboleni elifanayo, futhi ungahlanganyeli nomunye nomunye. Lesi sikhathi siphelela ezinsukwini ezintathu. Ngemva komunye usuku, amangqamuzana enza i-blastocyst, enamaseli angu-30. Lesi yisigaba sokuqala sokuthuthukiswa kweqanda le-fetal, ibhola elingenawo embryoblast elihlanganiswe kwenye yezindonga - umntwana ozayo. I-Blastocyst isilungele ngokugcwele ukufakwa endaweni epithelium yesibeletho.
Izimpawu zokukhulelwa kwama-oocyte
Umanyolo kwenzeka ezingeni leselula, ngakho-ke awubonakali kowesifazane. Yingakho kunzima ukuhlukanisa izimpawu ezijwayelekile zokukhulelwa kweqanda. Izimpawu zokuqala zokukhulelwa zingase zizwakale kuphela emva kweqanda elikhuliswe lihlanganiswe emgodini wesibindi, futhi lokhu kuzokwenzeka, ngokwesilinganiso, izinsuku ezingu-7 emva kokuhlanganiswa kwesidoda kanye neqanda. Lo mzuzwana ungabonakala njengokwesuka okuncane, okwesifazane ongayithatha ukuqala kokuya esikhathini. Ngaphezu kwalokho, ngokushesha emva kokufaka iqanda emzimbeni, isizinda se-hormonal siqala ukushintsha, bese izibonakaliso zokuqala zokukhulelwa ziqala ukuvela. Ngokujwayelekile lokhu kwenzeka ngaphambi kwamasonto ama-1.5-2 emva kokukhulelwa.
Kungani kungenjalo iqanda elikhuliswe?
Kwezinye izimo, yize i-ovum nesidoda behlangana, kukhona ukwephulwa kokukhulelwa. Isibonelo, kungenzeka ukuthi i-oocyte engasetshenzisiwe itholakale ngokushesha nge-spermatozoa emibili, okuholela ekwakheni
Kunoma yikuphi, ukuphendula ngokuqondile umbuzo othi kungani ukukhulelwa kungenzeki kunoma yimuphi umbhangqwana othile, udokotela kuphela ongakwazi ukuhlola ngokucophelela, ngoba izici eziningi ezihlukumeza kokubili isidoda kanye neqanda kufanele zenze ukuthi ukukhulelwa kuhlangane.