Ngaphambi kokuba ibhinqa linemifanekiso ayenokukhulelwa , iziganeko ezimangalisayo zenzeke emzimbeni wakhe. Ukususela kumzuzwana wokukhulelwa, xa inkunzi enenhlanhla ishaya iidizi zabanye ukuba ihlangane kunye kwaye iqule iqanda elikhutshwe ngelo xesha lenyanga, iwashi iqala ukukhawuleza kwiiyure ezingama-40 okanye ukuphuhlisa lomntu omtsha.
Nantsi ingqalelo kwizinto eziqhubekayo emva kweembonakalo ngeeveki zokuqala zokukhulelwa-isigaba segciwane.
Uhambo lokuqala loLutsha
Xa iqanda lixutywa, isiphumo sinomzimba owodwa obizwa ngokuba yi- zygote . Ngokukhawuleza i-zygote iyahamba, yenza indlela yayo esuka kwibhulophu ye-Fallopian apho ukuchumisa kwenzeka khona kwisibeleko. Ingathatha ixesha elide nje ngeveki ye-zygote ukugqiba uhambo.
Okwangoku, sele sele iqalile ukutshintsha. Kwiiyure ezingama-24 ukuya kwiiyure ezingama-36 zokuqumba, i-zygote iya kuqala ukwahlula kwaye ikhule kwinkqubo ebizwa ngokuthi i-mitosis. Esinye iseli siya kuba seseli ezimbini; Iiseli ezimbini ziya kuba iiseli ezine; iiseli ezine ziya kuba iiseli ezisibhozo; iiseli ezisibhozo ziya kuba seli-16; kwaye nangokunjalo. (Phantse isiqingatha se-zygotes musa ukwenza ngaphaya kwezi zimbalo zokuqala zesahlulo seeseli.)
Kwimpawu yeesibhozo ezisibhozo, iiseli ezandisayo ziya kuqala ukwahlula. Oku kuthetha ukuba ngamnye uya kuthatha iziganeko ezithile eziza kugqiba uhlobo lweseli ekugqibeleni luya kuba yintsholongwane yesikhumba, umzekelo, okanye i-cell okanye i-cell cell.
Njengoko iiseli zanda, zizahlukana zibe zihlulo ezimbini: uluhlu lwangaphakathi luzakugcina lube ngumbungu, ungqimba lwangaphandle luya kuba yi-placenta. Okwangoku ubukhulu beeseli buya kuba yi-blastocyst.
Ibhomu Ekugqibeleni
Xa i-blastocyst ifika kwindawo yayo yokugqibela, isinyathelo esilandelayo sisithuba esingaphandle seeseli ukuzifaka kwiindonga zesisu.
Baya kwenza oku ngokugubungela kwimigca yesibindi, ukukhupha imilambo yegazi encinci njengoko behlala kuyo. I-web yemithambo yegazi kunye neembrane, i-placenta, iya kwenza. Isakhiwo esimangalisayo siza kunika ukondla ekuphuculeni ukususela kwixesha eliyimibungu kuze kube yintsana ezalwe kwaye izalwe.
Ukutyunjwa akusoloko kusebenza ngokuzenzekelayo kunye nokuqinisekileyo komlilo. Abaphandi baqikelela ukuba malunga neepesenti ezingama-58 zonke iimpawu zendalo azizange zifakwe ngokusemthethweni kwisibeleko. Kodwa xa ukufakelwa kwempembelelo kuphumelele, utshintsho lwe-hormone oluya kuthi ekugqibeleni luvelise iimpawu zokukhulelwa luya kuqala. Okwangoku ulindeleke ngokusemthethweni ibhinqa liya kulahleka ixesha eliqhelekileyo kunye nolunye uvavanyo lweempawu zokukhulelwa: Amabele akhe angase avuvuke kwaye ahluthe, ukutya kwakhe kusenokutshintsha ngokuphawulekayo, unokulahlekelwa yintlungu yokutya okuthe ngqo, kwaye kungakhathaliseki ukhathele.
Kule nkalo, uvavanyo lokukhulelwa ekhaya luya kuba netiphumo elihle kwaye ubomi obutsha buya kuhamba kakuhle endleleni yokuzalwa.