Sifuna ukukuxelela ukuba isidoda ngendlela elula, ukuze ube nokuyicacisa koonyana neentombi zakho. Ngaphandle kwesifundo se-anatomy, esele benayo kwincwadi yabo yesifundo, sifuna ukuthetha nawe malunga nesidoda kunye yemvelo.
Idlozi yile iiseli zesini samadoda, kwaye zezona zincinci emzimbeni. Singathi yinto encinci kakhulu, inobude obungama-40 ukuya kuma-250 μm, iyunithi yokulinganisa kwii-micrometer. Inentloko, intamo, indawo ephambili kunye nomsila.
Isidoda kunye nokufikisa
Isidoda zenzeka rhoqo ukufikisa, kubo bonke ubomi bokuzala kwendoda. Xa umntwana efikelela kwiminyaka eli-10 okanye eli-11 ubudala, iiseli zokuzala ezingakhuliyo zihamba kwinkqubo ebizwa ngokuba yi-spermatogenesis. Ukuveliswa kwesidoda ngexesha lokufikisa kuvelisa ungcoliseko lasebusuku, zii-ejaculation ezenzeka ngelixa umntwana ofikisayo elele, kwaye ngendlela engekho zingqondweni.
Lixesha lokuba baqale ukuphindaphindeka ngokukhawuleza kwaye baqhubeke ukwahlula ukwahlula ukuze ekugqibeleni bakhule isidoda esivuthiweyo. Le nkqubo yenzeka ngaphakathi kumasende, ngakumbi kwimibhobho eyaziwa njenge iishubhu ezinesininzi. Ezi tubules zenziwe zimbini iintlobo zeeseli: iiseli zeSertoli kunye neeseli zedlozi. Ezi zokugqibela zezo zivelisa isidoda, kwaye ezinye ziyazondla kwaye zibakhusele.
Ngexesha lokufikisa ziveliswa ngesantya esikhawulezayo, ukuya kuthi ga kwi-1000 yesidoda ngomzuzwana. Kodwa ukusuka apho ukuya kwintoni ukukhula kukho inkqubo, engenzeki ngoko nangoko. Kuthatha iiveki ezininzi, iinyanga ezi-2 ukuya kwezi-3, ukuze idlozi elitsha lihambe ngokupheleleyo kwaye livuthwe kumasende.
Umgangatho wobudoda
Umsebenzi wesidoda kukuchumisa iqanda, nangona kunjalo, uninzi luyehla bafile okanye azinakho ukuchumisa. I-WHO ilinganise ukuba i-90% yevolumu yendoda ngexesha lokuchama ineemfihlo ezivela kumalungu esondo afikelelayo. Ngokufanelekileyo, uninzi lwencindi yobudoda ayisosidoda, kodwa iplasma yeseminal, eyi-alkaline, etyebile kwaye ityebile kwiswekile ye-fructose njengesondlo sesidoda, kodwa yona ngokwayo ayichumisi.
Ukwanda kweminyaka kudityaniswa ukuncipha yomgangatho wobudoda. Xa sithetha ngomgangatho siyayixabisa eyakho ukuhambaOko kukuthi, ukubanakho ukufikelela kwiqanda, ubume kunye nomthamo wesidoda. Iiseli ezinesiphene ziqhubeka neenkqubo zokufa kweseli ezicwangcisiweyo.
Umgangatho wobudoda kunye neeparameter azimanga. Oko kukuthi, kwindoda enye, izinto zobomi bakhe, ezinje ngoxinzelelo, utywala, amayeza athile, ziya kuba nefuthe kumgangatho wesidoda sakhe. Ukutya okunempilo, ukutyeba kwiziqhamo kunye nemifuno, kunye nokuziqhelanisa nokuzilolonga kunokunceda ekuphuculeni umgangatho wespematozoa.
Ezinye iinyani malunga nesidoda
Ebantwini, i-spermatozoa yiyo linoxanduva lokumisela isini sosana. Iqanda lihlala line-X chromosome yesini, kodwa isidoda ngasinye sinokuba ne-X chromosome okanye i-Y chromosome.
Emva kokuchama, isidoda sinako ukuchumisa iqanda kangangeentsuku ezintlanu. Kodwa amathuba okukhulelwa kwisidoda esidala asezantsi kakhulu. Banokuphila kwaye basebenze ukuya kuthi ga kwiintsuku ezintlanu kwinto yokuzala kwabasetyhini, kodwa abayi kuhlala bephila okanye emashidini, okanye kwiibhafu, okanye ezinye izinto ezithethwa ziintsomi zasedolophini.
Ngumsila, onokuba ziindidi ezi-4 ezahlukeneyo, ezimisela ubukhulu becala amandla alo okuhamba. Isantya apho isidoda sihamba khona kwi-ejaculation malunga Iikhilomitha ezingama-50 ngeyure.
Kude kube ngoku, isichumiso sinikwe kuthi njengohlanga olunokhuphiswano, nangona kunjalo oososayensi abavela kwiZiko laseTekhnoloji laseMassachusetts (MIT) bathi isidoda sihlangana, Njengesikolo seentlanzi ukwandisa amathuba okufikelela ngempumelelo kwiqanda. Intsebenziswano endaweni yokhuphiswano.