Egg Ukwakha: ulwazi ngokubanzi

Iqanda - iseli sex nemazi, equlethe isethi haploid zofuzo. Yayo njongo - ukukhutshelwa kolwazi yemfuza ngexesha isichumiso. Ubume beqanda kwindalo ukuba kakhulu kuhluka. Umzekelo, iqanda - nto amaqanda intlanzi, iqanda, njl uhlobo ngalunye lwesilwanyana uneempawu zawo.

Ubume yeentaka iqanda

Mhlawumbi lo mzekelo iphawulekayo kwesi sakhiwo zezi amaqanda iintaka kunye ezirhubuluzayo, apho ubukhulu becala iqumrhu elikumila kunjalo. Iqanda - kwiqanda elikhulu, nto leyo kulula ukufunda ngaphandle nezixhobo ezizodwa.

amaqanda iinkukhu ibandakanya sac, albumen kunye iqokobhe. Nganye kwezi ezinokuzuzwa uneempawu zawo. Le sac yi kwintsunguzi, tyheli, isakhiwo setyhula ibekwe esizikithini iqanda. Iqulethe lukhulu kwamafutha, iiprotheni, iivithamini, zombala kunye namaqanda izimbiwa. Injongo yalo esentloko - kuba zingamandla mbungu.

sac Top legqunyiwe vitelline inwebu ezingcakacileyo, yehlathi, phezu apho ingabonwa ibala elincinane ukukhanya - a blastodisc, leyo endaweni phambi kokuba kwezichumiso kweqanda ngumongo.

Okulandelayo na egg elimhlophe, nto leyo ithi yahlulwe iibhola ezine. Iqulethe eninzi protein, iivithamini kunye neeminerali. Ukongeza, kukho lysozyme - enzyme, onesiphumo antibacterial. Esebenzisa umaleko protein inokuba osalayo iigesi kuphela.

Protein camera podskorlupovymi iibhola ezimbini phakathi apho kukho umsantsa encinane. Shell Amaqanda - amaqanda ashinyeneyo kakhulu iqokobhe yokhuselo, leyo iqulathe ncakasana ngecalcium carbonate. Leqanda unokuba nende ezahlukeneyo umbala - ke iimpawu uphawu kweentlobo ngamnye.

Ubume kwamaqanda zabantu

iqanda lwabaseTyhini - iseli sex, apho igcinwa kwaye kuvuthwa i zoboya ze isizalo. Njengazo zonke izilwanyana, iseli yintsholongwane yabantu yenzelwe ukuba angadlulisela iseti zofuzo ngexesha lokwanda.

Mu kuya kwa nshita somatic, iiseli yintsholongwane eziveliswa meiosis, ngoko kuphela ziqulathe haploid (ebantwini ngu 23) isethi zofuzo. Iimpawu ngesakhiwo kwamaqanda babantu baya kuchazwe ngezantsi.

Eyona yokuqala ekhethekileyo - bubungakanani. Ukuba icandelo yesiqhelo iseli somatic kunqabile idlula micrometers-20, netoti neqanda elisesibelekweni sebhinqa nama-100 microns. Le iseli sex le imisiwe yaye kwi follicle de kube sekupheleni ekukhuleni kwabo.

Ngenxa yoko, ubume beqanda kuyafana nezinye iiseli emzimbeni - le nto ndiyibhalayo inucleus, kukho icytoplasm, kwaye kuphela ukuba i ndizayo plasma. Njengoko sele kukhankanyiwe, isiqalo haploid. Le kukho icytoplasm iqulethe ezininzi kakhulu ribosomes, mitochondria, kunye EPS.

Kwakhona, kulo lonke yeseli ngokulinganayo asasazwa ekuthiwa granules sac, nezinika amandla iseli de intshayelelo yayo eludongeni zesibeleko. Zheltkova igwebu ezele izondlo - ingakumbi amafutha kunye encinci protein, iivithamini kunye neeminerali.

neqanda elisesibelekweni sebhinqa uba isakhiwo kunye neempawu ngaphezulu. Ngokomzekelo, xa isitya olungaphandle kukho icytoplasm ziqulathe granules ezikhethekileyo secretory. Ngenxa kwii-amadlozi imixholo granule iyekelela kwaye enza phezu iqokobhe beqanda - ngenxa yoko, itshintsha isakhiwo sayo ngendlela eya kwenza ukuba kungabikho enye yenzala unako ukungena kuyo.

Okunye okunika umdla kukuba ukuba inani amaqanda umfazi efakwa emva kwixesha osandul zophuhliso. Kungenxa kwisithuba yophuhliso zamaqanda kwi kwimveku sele kwasekwa iqela elithile zoboya oocytes. Xa kuthelekiswa umzimba eyindoda, inkqubo ukuyilwa spermatozoa, ukususela ekufikiseni, oku kuya kuba sisigxina.

Njengoko ubona, ubume beqanda kakhulu ezithile kwaye iyahambelana ngokupheleleyo imisebenzi enze oko.