Gulu la majeremusi yazimayi

Selo lachiberekero lachiberekero, lomwe limatchedwa dzira, ndilopangidwe kamangidwe kakang'ono kozungulira, komwe kufalitsa kwa uniform kwa vitelline inclusions kukudziwika. Kunja, selo laling'ono la kubala, gamete lomwelo, liri ndi chipolopolo chowala ndipo ndizunguliridwa ndi maselo osakanikirana omwe amapanga zakudya. Kuphatikiza apo, iwo amachitanso gawo la mtundu wotchinga, choncho nthawi zambiri amayamba kugwira ntchito yoteteza.

Kodi ndizochitika zotani pakupanga maselo ogonana?

Dzira, lokhala ndi phokoso la chitukuko, limatchedwa oocyte. Maselo onse ogonana ali ogawidwa ndi meiosis. Tiyenera kukumbukira kuti pamagulu a magawano m'maselo achiwerewere pali zina. Kotero makamaka pa gawo loyamba la magawano dzira likuchedwa kukula, pamene likukula kukula.

Kwa amayi, ngakhale pa siteji ya chitukuko cha intrauterine, kuchokera ku oogonia - maselo oyambirira a kugonana, ma oocyte mamiliyoni ambiri amapangidwa. Ndiyenela kudziŵa kuti kwa nthawi ndithu asanabadwe atsikana a oocyte akusandulika kukhala follicles, mwachitsanzo, kuzungulira kwao kumapangidwa chipolopolo chomwecho, chomwe tatchulidwa pamwambapa.

Mapulogalamu onse omwe akukula akupitirirabe kukula ndipo pamapeto pake amawonongeka kapena amatulutsa ma oocytes omwe ali mkati mwawo. Tiyenera kukumbukira kuti munthu akamakula msanga wa oocyte amapezeka pokhapokha pa kuyamba msinkhu. Choncho, zikhoza kunenedwa kuti maselo achiberekero amakhala okhwima m'mimba mwake, kapena m'malo mwake.

Kodi ndi makhalidwe ati omwe amachititsa kusasitsa kwa maselo a kugonana?

Pakati pa kusasitsa, oocyte wamkulu amagawidwa ndi meiosis, zomwe zimapangitsa kuti apange oocyte wachiwiri, omwe amaposa kuposa kale. Pankhaniyi, selo ili liri ndi haploid, mwachitsanzo. magawo theka la chromosomal material, ndi yolk zambiri kuposa oocyte oyambirira.

Pambuyo pa kusasitsa kwa maselo ogonana aakazi, mathawiti, omwe ali pansi pa chivundikiro cha epithelium cha gland lokha, ovary, lasweka. Pambuyo pake, oocyte yachiwiri imalowa m'mimba mwachangu (njira yopangira mazira), yomwe imagwidwa ndi cilia yomwe imapezeka pamatope amkati, imadutsa mumatope.

Kodi ntchito zazikulu za maselo a kugonana ndi abambo ndi ziti?

Pokhala mutagwiritsa ntchito dzina la selo lachiwerewere lachiwerewere, mutapenda kayendedwe kake, ndikofunikira kunena za kufunikira kwake. Kotero, pakati pa ntchito ya mazira, nkofunika kutchula:

• kubereka - mwana wakhanda amapangidwa kuchokera ku dzira laubwamuna;
• kusungirako ndi kusamutsa zokhudzana ndi majini.