Yisiphi isigaba esihilela u-spermatogenesis?
Kuvunyelwe ukuhlukanisa izigaba ezine eziyinhloko ze-spermatogenesis:
- Ukukhiqiza.
- Ukukhula.
- Ukuvuthwa.
- Ukufometha.
Ngamunye wabo unezici ezikhethekile futhi unezincazelo ezithile eziphilayo. Okokuqala, kufanele kuthiwa ukuthi i-testis ngokwayo iqukethe inani elikhulu lamathambo. Kulolu cala, udonga lwalowo nalowo lunamathemitha amaningana amangqamuzana, okuyinto emele izitebhisi ezilandelanayo ekuthuthukiseni i-spermatozoa.
Kwenzekani esiteji sokukhiqiza?
Ingqimba yangaphandle yamaseli we-tubini ezinama-seminiferous imelwe yi-spermatogonia. Lawa maseli anomumo ojikeleziwe, ene-nucleus enkulu ecacisiwe kanye nenani elincane le-cytoplasm.
Lapho kuqala ukukhulelwa, ukuhlukana okusebenzayo kwala maseli kuqala nge-mitosis. Ngenxa yalokhu, inani le-spermatogonia ku-testes landa kakhulu. Isikhathi lapho ukuhlukaniswa okusebenzayo kwe-spermatogonia kwenzeka khona empeleni isiteji sokukhiqiza.
Iyini isiteji sokukhula ku-spermatogenesis?
Ingxenye ye-spermatogonia ngemuva kwesigaba sokuqala esendaweni yokukhula, esetshenziselwa ukukhanya kancane eduze kwe-lumen ye-tuble seminiferous. Kule ndawo lapho kunokukhula okwenziwe ngobukhulu beseli lokuzala, okufezwa ngokukhulisa umthamo we-cytoplasm, okokuqala. Ekupheleni kwalesi sigaba, ama-spermatocytes e-oda lokuqala akhiwa.
Kwenzekani esiteji sokuvuthwa?
Lesi sikhathi sokuthuthukiswa kwama-germ cells sigcizelela ukuthi kwenzeka ukuhlukana okusheshayo okusheshayo. Ngakho-ke kusuka ku-spermatocyte ngayinye ye-oda elingu-1, ama-spermatocyte amabili e-oda amabili ayenziwe, futhi ngemva kokuhlukaniswa kwesibili kunezinhlobo ezine ze-spermatids ezine-oval shape nobukhulu obukhulu. Esigabeni sesine, ukwakheka kwamaseli ocansi- i- spermatozoa- kubeka indawo . Kulesi simo, iseli lithola ukubonakala okujwayelekile: ihlangene, i-oval ne-flagella.
Ukubona okungcono kwazo zonke izigaba ze-spermatogenesis, kungcono ukusebenzisa itafula, kodwa uhlelo olubukeka lubonisa izinqubo ezenzeka kuzo ngamunye wabo.
