Yiyiphi inqanaba equka i-spermatogenesis?
Iyavunyelwa ukuhlukanisa izigaba ezine eziphambili ze-spermatogenesis:
- Ukuzaliswa.
- Ukukhula.
- Ukukhula.
- Uqeqesho.
Ngamnye wabo unobunqunu bakhe kwaye unentsingiselo ethile yezinto eziphilayo. Okokuqala, kufuneka kuthiwa i-testis ngokwayo iqukethe inani elikhulu leetulul. Kule meko, udonga lwalowo nalowo lunemiqolo emininzi yeeseli, okubhekiselele kwizigaba ezilandelelanayo ekuphuhliseni i-spermatozoa.
Yintoni eyenzekayo kwisigaba sokuvelisa?
Uluhlu lwangaphandle lweeseli zee-tubini ze-seminiferous limelelwa ngu-spermatogonia. Ezi iiseli zinomxholo ojikeleziweyo, kunye nenucleus enkulu ecacileyo kunye nenani elincane le-cytoplasm.
Ngokuqala kokutshatyalaliswa, ukuhlukana okusebenzayo kwezi seli kusetyenziswa yimatosis. Ngenxa yoko, inani le-spermatogonia kwiimvavanyo liye landa kakhulu. Ixesha apho ukwahlukana okusebenzayo kwe-spermatogonia kwenzeka khona ngokwenene kwinqanaba lokuvelisa.
Iyintoni isigaba sokukhula kwi-spermatogenesis?
Icandelo le-spermatogonia emva kokuba isigaba sokuqala sifudukela kwindawo yokukhula, ebizwa ngokuthi i-anatomically esondele ngakumbi kwi-lumen ye-tubule ye-seminiferous. Kule ndawo ukuba kukho ukwanda okwenyuka ngobukhulu beself reproductive, eyenziwa ngokunyusa umthamo we-cytoplasm, kwindawo yokuqala. Ekupheleni kweli nqanaba, i-spermatocytes yokuqala yenziwe.
Yintoni eyenzekayo kwisigaba sokukhula komzimba?
Eli thuba lokuphuhliswa kweeseli zentsholongwane libonakaliswe ngokubakho kwezigaba ezimbini ezihamba phambili ngokukhawuleza. Ngoko-ke kwi-spermatocyte nganye ye-1, i-spermatocytes ye-2 imiyalelo yenziwa, kwaye emva kwesigaba sesibini kukho i-spermatids ezine ezine-oval shape kunye nobukhulu becala. Kwinqanaba lesine, ukubunjwa kweeseli zesini- spermatozoa-kuya kwenzeka . Kule meko, iseli ithola imbonakalo eqhelekileyo: idibeneyo, i-oval kunye neflagella.
Ukuqonda okungcono kwazo zonke izigaba ze-spermatogenesis, kungcono ukusebenzisa itafile, kodwa icebo elibonisa ngokubonakalayo iinkqubo ezenzeka kuyo nganye.
