ImpiloImpilo yabesifazane

Ukuthuthukiswa kwengane: izigaba eziyinhloko

ukuthuthukiswa Natal umuntu - inkathi kusukela ukwakheka zygote (amaqanda avundiswa) ekuzalweni umbungu owakheke ngokugcwele ukuthi iphila ngaphandle abesifazane esibelethweni.

Nkathi ngokuthi zabakhulelwe. Luthatha izinsuku 280. Hlukanisa izigaba ezilandelayo ukuthuthukiswa umbungu:

• kwesikhathi sokuqala - libhekene nokwehlukaniswa iqanda avundiswa, ukwakheka blastula futhi yenzeka yayo ulwelwesi kwesibeletho. Kokukhulelwa kwenzeka Fusion of gametes besifazane kanye namadoda, kwakheka okuyinto zygote nge apharathasi diploid zofuzo. Kulokhu, ubulili yengane kunqunywa-chromosomes of isidoda ukuthi avundiswa iqanda. Ngokwesibonelo, uma iqukethe X-chromosome ke uyintombazane, uma mina - ukuthi umfana. Imibhalo yokuqala esigabeni kwasani senzeka tube fallopian. Inqubo iphela ukulungisa yenzeka iqanda eselivundisiwe e ukushuba we ungqimba lwamafinyila kwesibeletho, lapho eminye sihamba ukuthuthukiswa yayo;

• embryonic period - kumiswa embungwini isisekelo izitho zakhe zangaphakathi. Intrauterine kwengane esiswini kulesigaba kuyinto inqubo gastrulation lapho akhiwa ezintathu izingqimba lwegciwane. Ngaphezu kwalokho, kuboniswa labetibambile (kwezicubu wabeka eziyishumi nemitshingo) histo- futhi organogenesis. isonto Eight umbungu seluvele isisindo mayelana 4 amagremu. Echaza izici akhiwa izandla nezinyawo;

Isikhathi se-fetus - kuhambisana nokwanda okwengeziwe nokuthuthukiswa umbungu, osuvele eyaziwa ngokuthi izithelo lwenyanga yesithathu yokukhulelwa. Njengoba kuboniswe nucleus ithambo Ukuqina sekuyenzeka kwakhiwa, isikhumba embozwe fluff iqala izwakale ukushaya kwenhliziyo umbungu, owesifazane azizwa ukunyakaza kwakhe. ukuthuthukiswa kwengane ngalesi sikhathi libhekene izinqubo okukhulu ukukhula nezicubu kwamangqamuzana.

Isigaba sokugcina kuyinto ukulethwa. isiqalo sabo kwabangela lapho kukhululwa le oxytocin hormone, okuyinto kuveza indlala pituitary. Lokhu i-hormone kuvusa lesizalo imisipha, okuholela push wengane ku ukhalo nokuzalwa umsele.

Kufanele ukuthi ukuthuthukiswa umbungu e utero libhekene ezithile ezibucayi lapho umbungu siyenzeka hypersensitivity izici ezingezinhle zangaphandle. Phakathi nezinyanga zokuqala ezintathu zokukhulelwa, kanye nomshikashika, adinga ukunakekelwa okukhethekile ukuze isimo owesifazane okhulelwe. Ngaphansi kwethonya ngesikhathi ezintweni ezingezinhle kwemvelo kwandisa ingozi yokungenwa kwezinso ehlukahlukene sengozini kanye yezinkinga ngesikhathi noma ngemuva kokubeletha.

Kufanele kuphawulwe ukuthi kwengane esiswini kuhambisana kumiswa isitho esingavamile esingaphakathi - placenta, okuvumela ukuba bazale abantwana esibelethweni. Kuyinto indlela ebalulekile yokujwayela imvelo. umsebenzi Its main - iqhaza exchange igesi umbungu, supply yayo kwezakhi nomoya-mpilo, kanye uketshezi hormone loniketa inkambo evamile ukukhulelwa.

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