Kusimwa kweiki ndiyo imwe yenhanho yekuenda kumwedzi. Ovogenesis ndiro zita rezvesayenzi rekushandiswa kweii mazai mumayamu. Chimiro cheii chikafu, chakine mugove wekudya wekusimbisa hupenyu hwembryo pazvikamu zvekutanga zvekusimudzirwa.
Iyo yose yekuenda kumwedzi inodzorwa nemahomoni, iyo iyo iyo inobva yasimuka, zvino inoderera muropa. Apo uwandu hwemhando ye-follicle-inosimudzira hormone inowedzera, zamai anokura (anobereka).
Mazuva mangani iyoi inokura?
Nguva yekutsvaga kweii inogona kupera kubva mumazuva mazhinji kusvika pamwedzi, asi kazhinji kacho kushandiswa kweiyi kunotora mavhiki maviri.
Mune follicles ivo pachavo, hormone estrogen inobudiswa, pasina iyo yakasarudzika mazai okutsvaira uye ovulation haigoneki. Apo estrogen inosvika pane imwe nhanho (yakanyanya), chirwere chepituitary chinowedzera kubudiswa kweimwe rudzi rwehomoni, luteinizing. Pasi pesimba rei hormone, chiremera chakakura chinosiya uporo, huvhu hunoitika.
Dzimwe nguva pane kuwirirana kwemaawa maviri, pamwe chete panguva imwechete yekuita humwe chiedza chichaonekwa mapatya. Hazvirevi kuti ivo vachave vakafanana, nokuti ivo vakasiyana. Asi kana muchikamu chekuparadzaniswa imwe yeza inobereka inoparadzaniswa kuva maviri kana zvimwe zvikamu, ipapo zvakangofanana zvakafanana mapatya achazvarwa.
Mukadzi wechikadzi masero, kubva kwariri mhuka ine utano inogona kukura semugumisiro wekudyara, ine haploid (isina) yekromosomes. Chigumisiro chekupedzisira chinoenderana neketani yemakromosomes iyo egg ine. Kana panguva yekutsvaga muzai pane kutyora kwechimiro chekromosomes kana kuchinja munhamba yavo, zvino ivha isingawanzoitiki. Kana mazai akadaro akabatanidzwa, saka mumatambudziko mazhinji embryo inokura kubva pairi inofa pane imwe yenhanho yekudzivirira.
Ivha inenge yakagadzirira kubereka rini?
Mushure mokunge hovulation yaitika uye mazai akakura akabuda kubva kumapurisa kusvika mumimba mimba, inotorwa ne fallopian tube uye inotungamirirwa kune chikamu chakati. Evha inonyura zvishoma nezvishoma iyo tube kusvika muchibereko. Iyi ndiyo nguva yakakodzera kwazvo yekudyarwa kweii. Kana kudyara kusati kwaitika, kana mukati maawa makumi maviri evha yaizofa. Kuti uwedzere mikana yekubata pamuviri, unofanirwa kuziva kuti zuva rinoberekai. Kazhinji jai rakakura rinogadzirira kubereka pazuva 14 rekufamba. Zuva rino ndiyo inonyanya kukoshesa kumera.
Sei mazai asina kubvaruka?
Pane zvikonzero zvakawanda zvechiitiko ichi. Kazhinji kacho ndeyekuti:
- matambudziko nehovulation, apo nguva yekuenda kumwedzi inopfupika kana, zvakare, kwenguva refu. Pane ngozi yokuti egg haigoni kuibva kana kuti haigoni kuitika;
- kusagadzikana kwemavha mavari nemhaka yekusagadzirwa kwemahomoni anodiwa, ndicho chikonzero chekutsvaga kwehuputi hunovhiringidzika. Evha iri munyaya iyi haibvumi zvachose, kana kuti haigoneki. Zvinokonzerwa neHormonal dzimwe nguva zvinokonzera kusakwana kwakakwana kwekuenda kumwedzi uye kuchenesa mazai. Kuita zvechisimba kunogona kukanganisa kwete mahomoni ezvepabonde chete, asiwo mapurogiramu ehutachiona;
- zvirwere zvemagenhe, zvakadai seT Turner's syndrome, zvinotungamirira pakuzvarwa kwevasikana avo vakanyanyisa kufambiswa kana kuti vasina zvachose mavhinga, izvo zvinoita kuti kushamba kweii kusakwanise;
- Matambudziko akasiyana-siyana uye zvirwere - polycystic ovary, kukanganisa munharaunda yemukango, kukanganiswa kwemukati, kukanganisa mawere, mavanga pamakumbo ekuvhara mazamu mushure mekuvhiyiwa - izvi zvose zvinotungamirira mukurasikirwa kwakakwana kana kukanganiswa kwekwanisi yekugadzira ovum yakazara.
