Kwiiyunithi, iiseli zesini zomfazi (i-ovules) zivuthiwe, iingxaki ezibandakanya iingxaki ngokukhulelwa komntwana. Kanti le nqwelwana yomeleleyo phakathi kwamanye amaninzi.
Zingaphi i-ova kumzimba wesetyhini?
Kwanesisu sikamama, intombazana ifumana inani elithile le-ovules, elizungezwe iifollicle. Kwintombazana ezalwe, inani lamaqanda ligidi, kwaye iikhilomitha ezimbalwa kuphela zihlala zisakhula. Kubalulekile ukuba neengcamango zingaphi i-ovules ibhinqa linayo, kwaye liqonde ukuba ngobudala, inani labo alinyuli. Ngokuphambene noko, iyancipha kuphela. Enyanisweni, ngokungafani nendoda yesilisa, iqanda aliyikuhlaziya kulo mfazi. Kukholelwa ukuba xa uneminyaka engama-35 kukho amaqanda angama-70,000 kuphela, amaninzi awo angenasiphene. Kodwa ke le nani lamaqanda lidla ngokwaneleyo ukuba ibhinqa likhulelwe.
Inkqubo yokuhluthwa kweqanda
Iqanda liqala ukuvuthwa ebusheni, xa kuqalwa umjikelezo wesini. Ngoko ke, kucacile ukuba i-ovum idla ngokukhawuleza kangakanani kule mzuzu - oku kwenzeka kanye ngexesha lomjikelezo wenyanga. Ngexesha lokuvuthwa, xa iqela elivuthiweyo liphuma kwi-ovary kwaye ithunyelwa kwi-spermatozoon, lo mfazi unethuba lokukhulelwa.
Ixesha lokuvuthwa kweqanda lingadlulela kwiintsuku ezisibhozo ukuya kwinyanga, kodwa ngokulinganayo kuthatha iiveki ezimbini. Okokuqala, phantsi kwesenzo se-follic-stimulating hormone, ubuqili buqala ukukhula kwi-ovary. Kuyaziwa ukuba mangaphi i-ovules kwintolthi yodwa ekhethiweyo yokunyuka kwi-ovulation kulo mjikelezo. Okokuqala, ububanzi bentollic kunye neqanda li-millimeter elilodwa, kwaye emva kweveki ezimbini sele sele lifikelela kumithamitha amabini. Ukuvuthwa kwenzeka phakathi komjikelezo, xa i-pituitary gland ikhupha inani elininzi le-hormone ye-luteinizing. Ubomi bexesha le-ovum emva kwe-ovulation iiyure ezingama-24.
Ibhinqa lihlala malunga neentsuku ezingama-400, oku kuthetha ukuba amawaka amaqanda emzimbeni wakhe ayanele ngokwanele ukuba azalwe. Kodwa ingxaki ayikuphela nje yokuba kunye nexesha le-ova liba lincinci, kodwa kwakhona kwinto yokuba balahlekelwa ngokuthe ngcembe kumgangatho wabo. Ngako oko, kubalulekile ukubaluleka ukuba uninzi kangakanani i-oocytes ibhinqa elikhoyo kunye nokuba yintoni imeko yakhe. Iinkqubo ezintsha zokumisela indawo yokugcina amaqanda ziphuhliswa. Olunye uvavanyo oluvakalayo kwinani lamaqanda luvavanyo lwe-EFORT, olunquma ukuphendula kwe-ovary ekufakweni kwe-hormone evuselela i-hormone emzimbeni.