Spermatogenesis: yintoni kunye nendlela ezenzeka ngayo izigaba eziphambili

Umxholo

• Amanqanaba aphambili e-spermatogenesis
• 1. Isigaba sokuntshula
• 2. Isigaba sokukhula
• 3. Isigaba sokuvuthwa
• 4. Isigaba somahluko
• Ilawulwa njani i-spermatogenesis

I-Spermatogenesis iyahambelana nenkqubo yokudala isidoda, eziyizakhiwo zesilisa ezijongene nokuchumisa kweqanda. Le nkqubo ihlala iqala malunga neminyaka ye-13, iqhubeka kubo bonke ubomi bendoda kunye nokwehla ebudaleni.

I-Spermatogenesis yinkqubo elawulwa kakhulu ziihormone, ezinje nge testosterone, luteinizing hormone (LH) kunye ne-follicle evuselela i-hormone (FSH). Le nkqubo yenzeka mihla le, ivelisa amawaka amadlozi yonke imihla, agcinwa kwi-epididymis emva kokuveliswa kwayo kumatyhalarha.

Amanqanaba aphambili e-spermatogenesis

I-Spermatogenesis yinkqubo entsonkothileyo ehlala phakathi kweentsuku ezingama-60 ukuya kuma-80 kwaye inokwahlulwa ngokwamanyathelo ambalwa:

1. Isigaba sokuntshula

Isigaba sokuhluma sisigaba sokuqala se-spermatogenesis kwaye senzeka xa iiseli zentsholongwane yexesha le-embryonic ziye kumasende, apho zihlala zingasebenzi kwaye zingakhuli, kwaye zibizwa ngokuba zii-spermatogonias.

Xa inkwenkwe ifikisa kwinqanaba lokufikisa, isidoda, siphantsi kwempembelelo yehomoni kunye neeseli zeSertoli, ezingaphakathi kwamatyhalarha, zikhula ngamandla ngakumbi ngokwahlulahlula iiseli (mitosis) kwaye zivelise iipermatocytes eziphambili.

2. Isigaba sokukhula

Iipermatocyte eziphambili ezenziwa kwisigaba sokuhluma sonyusa ubungakanani kwaye ziyaqhubeka nenkqubo ye-meiosis, ukuze izinto zazo zofuzo ziphindwe kabini, zaziwe njenge-spermatocytes yesibini.

3. Isigaba sokuvuthwa

Emva kokwenza i-spermatocyte yesibini, inkqubo yokuvuthwa yenzeka ukunika amandla kwisidoda ngesahlulo se-meiotic.

4. Isigaba somahluko

Iyahambelana nexesha lokuguqulwa kwesidoda kwisidoda, esihlala malunga neentsuku ezingama-21. Ngexesha lokwahlulahlula, elinokubizwa ngokuba yi-spermiogenesis, izakhiwo ezimbini ezibalulekileyo zenziwa:

• Ingqumbo: sisakhiwo esikwintloko yesidoda esinee-enzymes ezininzi kwaye esivumela isidoda ukuba singene kwiqanda lomfazi;
• IsibethoIsakhiwo esivumela ukuhamba kwesidoda.

Ngaphandle kokuba ne-flagellum, isidoda esenziweyo asinayo inkungu de iwele i-epididymis, ifumane amandla okuchumisa kunye namandla okuchumisa phakathi kweeyure ezili-18 ukuya kwezingama-24.

Ilawulwa njani i-spermatogenesis

I-Spermatogenesis ilawulwa ziihomoni ezininzi ezinganeli nje ukuxhasa ukukhula kwamalungu esini samadoda, kodwa kunye nokuveliswa kwesidoda. Enye yehomoni eziphambili yi testosterone, eyihomoni eveliswa ziiseli zeLeydig, eziyizisele ezikhoyo kumatyhalarha.

Ukongeza kwi-testosterone, i-luteinizing hormone (LH) kunye ne-follicle evuselela i-hormone (FSH) nayo ibaluleke kakhulu kwimveliso yesidoda, njengoko ivuselela iiseli zeLeydig ukuba zivelise iiseli ze testosterone kunye ne-Sertoli, ukuze kubekho inguquko yespermatozoa kwi-spermatozoa.

Qonda indlela esebenza ngayo umgaqo wehomoni kwinkqubo yokuzala yamadoda.