Impilo, Impilo yabesifazane
Ukuthuthukiswa kwengane: izigaba eziyinhloko
ukuthuthukiswa Natal umuntu - inkathi kusukela ukwakheka zygote (amaqanda avundiswa) ekuzalweni umbungu owakheke ngokugcwele ukuthi iphila ngaphandle abesifazane esibelethweni.
• 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;
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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 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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