Ndezvipi zvinoshandiswa nemuchechi anosvika pavhiki 3?
Panguva ino, kushandiswa kwekugadzirisa kwakagadzirirwa zvachose uye iyo fetal egg inowanikwa muuranda uterine. Panzvimbo iyo iyo placenta ichave iri mune ramangwana , villi fomu, uye mune imwe neimwe inotanga kukura capillary. Icho chigadziro chinopa nzvimbo yemwana, iyo inotanga kuumbwa kubva mavhiki mashanu kusvika ku6.
Kana tichitaura pamusoro pezvinoitika kumwana chaiye mune vhiki yechitatu yekuzvitakura, zvakakosha kuziva kuti panguva ino iye akasiyana zvachose nemunhu. Kukura kwaro hakuiti kudarika 0.15 mm uye kunze kwema embrosi yakafanana nemafungiro eatricle ayo anowanikwa mukati memucheche.
Chikamu chechipiri chegastrulation, iyo inoratidzwa nekuumbwa kwamashizha emashizha, inoenderera mberi. Panguva ino, kuumbwa kwe-neural tube, neural crest, chord, kubva kune nhengo dzexiki dzinoumbwa munguva yemberi, inonzi. Panguva imwecheteyo, bhukimaki remangwana yemwoyo (midziyo, mwoyo), zvinofarira (pronephros) zvakanyorwa.
Pavhiki yechitatu yekushaya simba, embryo ine mavambo emagumo emangwana, mapuranga nemakumbo, uropi, huputi, mapapu. Ikoko kune kupararira kwezvinonzi oropharyngeal membrane, panzvimbo iyo muromo unoumbwa munguva yemberi.
Chii chinoitika kune amai vari mberi?
Panguva ino mukadzi anotarisira kutanga kwemazuva anotevera ekuenda kumwedzi, kazhinji zviratidzo zvekutanga zvinonzwisisika sezviratidzo zve premenstrual syndrome:
- nausea;
- kupesana kwechido, kutaridzika kwekunakidza kunakidzwa;
- kusawirirana kune zvinonhuwira;
- kushaya simba;
- kutsamwa.
Kuti udzidze nezvekudzivirira pamuviri panguva ino, unogona kushandisa chirwere chepamuviri chekuita.