Ukuvavanywa kwamandla kubantu
Uvavanyo lokuzala komntu, olunokuthi lwenziwa ekhaya, lusetyenziswe ukuvavanya ubuninzi besisu emva kokuqokelela kwisitya esikhethekileyo. Njengomphumo wesifundo esinjalo, kunokwenzeka ukufumanisa ukuxilongwa kwe-spermatozoa kwizinto eziqokelelweyo, ezibonisa ngokuthe ngqo ukuba amandla obawo ozayo azalise.
Enyanisweni, uvavanyo olulolo hlobo aluxhomekanga kakhulu. Kwezinye iimeko, amadoda anesityalo esincinci nangona nenani elikhulu le-spermatozoa kwi-semen, nangona kunjalo. Ukuvavanya ikhono lomntu osemtsha ukukhulelwa kule ngxaki, ukufundwa ngokubanzi kwendoda yakhe kunye nokufunyanwa kwejubane kunye nokunyaniseka kwe-spermatozoa, eqhutywa kuphela kwiimeko zeziko lempilo, kuya kufuneka.
Uvavanyo lwekhaya lokuzala komfazi
Iimvavanyo zokumisela ukuzala kwabafazi baneentlobo ezimbini:
Iimvavanyo zokumisela ukuxinwa kwe-homlicular-stimulating hormone. Ukuba kukho inani elikhulu lamaqanda emzimbeni wowesifazane, oza kutshaba kunye nokuphuma kwinqanaba elizayo, izinga lihlala liphantsi. Xa kukho amancinci ambalwa kunye nama-ovari ambalwa kuma-ovari, ukunyuka kwe-FSH kwandisa kancane kancane.
Iimvavanyo zokumisela izinga le-hormone ye-luteinizing. Uxinzelelo oluphezulu lwe-LH luyimfuneko ukukhutshwa kweqanda elivuthiweyo kwi-ovary. Ngokuqhelekileyo, inqanaba liphakama iintsuku ezimbalwa ngaphambi kokuba kuqalwe i-ovulation kwaye ihlala iphakamileyo ngokwaneleyo kwiintsuku ezingama-1-2 emva kokugqitywa kwayo.
Olu vavanyo lunokunika ingcamango yokuzala kwabasetyhini ngexesha lokuziphatha kwabo kwaye kukuvumela ukuba ukhangele indlela ephakamileyo yokukhulelwa ngosuku lokufunda.