Muna so mu gaya muku abin da suke maniyyi a hanya mai sauki, domin ku ma ku bayyana shi ga 'ya'yanku maza da mata. Bayan wani darasi na ilmin jikin mutum, wanda suke dashi a littafin karatun su, muna so muyi muku magana game da maniyyi halitta.
Maniyyi ne kwayoyin halittar maza, kuma sune mafi kankanta a jiki. Zamu iya cewa wani abu ne mai ƙaramar ƙarama, yana da tsayin 40 zuwa 250 μm, ma'auni na ma'auni a micrometers. Ya ƙunshi kai, wuya, tsakiya, da jela.
Maniyyi da balaga
Maniyyi faruwa koyaushe daga balaga, A duk lokacin haihuwar mutum. Lokacin da yaro ya kai shekaru 10 ko 11, ƙwayoyin halittar haihuwa da ba su balaga ba sun bi tsarin da ake kira spermatogenesis. Samun maniyyi yayin balaga yana haifar gurɓataccen dare, maniyyi ne da ke faruwa yayin da saurayi ke bacci, kuma ta hanyar da ba a san su ba.
Lokaci ne lokacin da suka fara ninka cikin sauri kuma suke ci gaba da rarrabuwa da rarrabuwa don haifar da ingantaccen kwayayen maniyyi. Wannan aikin yana faruwa ne a cikin kwayar halittar jikin mutum, musamman a hanyoyin da aka san su seminiferous tubules. Wadannan tubules din sun kunshi kwayoyi guda biyu: Sertoli cell da spermatogenous cells. Na karshen sune wadanda ke haifar da maniyyi, wasu kuma suna ciyar dasu kuma suna basu kariya.
A lokacin balaga ana haifar da su cikin saurin gaske, har zuwa maniyyi 1000 a dakika daya. Amma daga can zuwa menene balaga akwai tsari, wanda ba nan take ba. Yana daukar makwanni da yawa, wata 2 zuwa 3, kafin sabuwar maniyyin ta zama cikakkiyar motsi kuma ta balaga a cikin kwayoyin halittar.
Maniyyin maniyyi
Aikin maniyyi shine takin kwai, amma, mafi yawan inzali sun mutu ko sun kasa yin takin. WHO ta kiyasta cewa kashi 90% na adadin maniyyin namiji yayin fitar maniyyi ya kunshi boye ne daga kayan aikin jima'i. Wato, yawancin maniyyi ba maniyyi bane, amma ruwan jini, wanda yake na alkaline, mai kauri kuma mai dumbin sukari na fructose a matsayin sinadarin gina jiki ga maniyyi, amma shi kansa baya taki.
Ageara yawan shekaru yana hade da raguwa na ingancin maniyyi. Lokacin da muke magana game da inganci muna darajar ku motsi, ma'ana, karfin isa ga kwayayen, tsari da yawan maniyyi. Cellswararrun ƙwayoyin halitta suna aiwatar da tsarin mutuwar kwayar halitta.
Maniyyi inganci da sigogi ba tsayayyu bane. Wato, a cikin mutum ɗaya, abubuwan da ke rayuwarsa, kamar damuwa, giya, wasu magunguna, za su rinjayi ingancin maniyyinsa. Kyakkyawan abinci, mai wadataccen kayan marmari da kayan marmari, da aikin motsa jiki na iya taimakawa inganta ƙimar spematozoa.
Sauran abubuwa game da maniyyi
A cikin mutane, spermatozoa sune ke da alhakin tantance jima'i na jariri. Kwai koyaushe yana da X-chromosome na jima'i, amma kowane maniyyi na iya samun korominoma na X ko Y chromosome.
Bayan fitar maniyyi, maniyyi zai iya hada kwai na tsawon kwanaki biyar. Amma damar samun ciki daga tsohuwar maniyyi ya ragu sosai. Zasu iya rayuwa kuma suyi aiki har na tsawon kwanaki biyar a cikin kwayar halittar haihuwa ta mata, amma ba zasu wanzu da rai ko a cikin mayafi, ko baho, ko wasu abubuwan da almara na gari ke magana akai ba.
Wutsiya ce, wacce ke iya zama nau'ikan nau'ikan 4, waɗanda yawanci ke tantance ƙarfin motsin ta. Saurin da maniyyi ke motsawa a cikin maniyyi yana kusan Kilomita 50 a awa daya.
Har zuwa yanzu, an gabatar mana da takin zamani a matsayin tseren gasa, duk da haka masana kimiyya daga Massachusetts Institute of Technology (MIT) suna jayayya cewa maniyyi ya dunkule wuri daya, kamar makarantar kifi don haɓaka damar samun nasarar kaiwa ƙwai. Hadin gwiwa maimakon gasa.