Kuberekwa 5 vhiki - kukura kwe fetus

Kubudirira kwema fetus panguva yevhiki masere ekuzvimba kunokurumidza. Panguva ino ichiri chiduku che blastocyst, chinongopinda mukati memukati mutsara wehutachi uterine. Panguva imwecheteyo, fetus inogamuchira zvokudya zvose kubva kuna amai, kuburikidza neropa rake. Irovary, iyo yakabudisa zera rakakura, rinoramba richibudisa progesterone, nekuda kwekubata pamuviri kunogara.

Chii chinoita kuti mwana aone semavhiki mashanu?

Phiki yechishanu yekukudzimara, mwana akafanana necheputi yenguva. Kureba kwomuviri wake panguva yakatarwa kunenge kusingadi kupfuura 2 mm. Zvisinei, pasinei nemazana akaduku akadai, mwoyo wemukomana panguva ino watotanga kumira. Iko kushandiswa kwekuvandudzwa kwezvizhinji zvenhengo dzomukati dzomwana asati aberekwa. Uyezve, zviso zvemaziso zvinotanga kuumbwa, uye muchimiro chacho chiri kure zvakangofanana nemunhu mukuru. Nokudaro, ikozvino zvigoneka kukwanisa kusiyanisa mhino, zvikamu zvekutanga zvemaziso zvinokura izvo zvinonyanya kujeka kujekesa.

Ndezvipi kuchinja kunoitika mumuviri wemukomana pavhiki 5?

Kubudirira kwema fetus pavhiki yechishanu yekuzvitakura kunopfurikidza nekuumbwa kwezvikamu zve-extraembryonic, izvo zvinokonzera kutsigirwa kwehupenyu hwehupenyu hwose, nepo huchiri mumwana. Saka pakutanga zvimwe villi ye chorion zvaive nyore kuratidza, uye iye zvino mumwe nomumwe wavo anowanzobuda. Mushure mokudaro, mwana anotanga kudya kwete nekuparadza masero emaviri akamukomberedza, asi anowana mishonga yose inokosha kubva kuna amai vake. Iropa remukadzi ane pamuviri uyo achaunza zvinhu zvose zvinobatsira kumucheche, kushambidza villus yemuorivhi. Somugumisiro wekuchinja kwakadaro, pavhiki yechishanu yekuberekwa kwemukomana, utero-placental ropa circulation inorongwa.

Yakagadzirirwa kusvika zuva rino, iyo yekutanga placenta inotorwa kuti ishande. Inotanga kuita mabasa ekufuridza, kudya, uyewo kusarudzwa uye mutemo, kupararira kweropa munzvimbo inopesana, inopiwa kune iyo. Mukuwedzera, iyo ipascenta inoderedza simba rekudzivirirwa kwezvirwere zvemaamai, izvo zvinodzivisa kurambwa kwema fetus pakutanga.

Zvose zviri pamusoro apa zvinotanga kukura pavhiki yechishanu yekuzvitora uye zvinobatsira pakuvandudza mwana. Iyo placenta haisati yakakwana zvakakwana yekudzivirira embryo kubva kune zvinokuvadza kunze kwemaitiro. Ndicho chikonzero ichi nguva yekubereka vana vekuberekwa kunonzi chirwere, tk. kune mikana yakakura yekubvisa pamuviri kamwechete.