Iveki yama-27 yokukhulelwa kukuqala kwekota yesithathu yokukhulelwa . Ngalesi sikhathi ubunzima bomntwana bufika ku-1 kilogram, ubude - 34 cm, ububanzi beentloko - 68 mm, ubukhulu becala besisu - 70 mm, nesifuba - 69 mm. Kwiveki yama-27 yokukhulelwa, ukunyuka kwe-fetal kuba yinto ebonakalayo ngakumbi, njengoko umntwana sele sele efikelele kwisayizi esanele ngokwaneleyo, inkqubo yayo ye-musculoskelet iqhubeka iphucula ngoko ke, ukunyakaza kusebenza.
Ukutshintsha kwe-Fetal ngeveki 27
Kwiiveki ezingama-27 umntwana uyakhiwa ngokusemthethweni: inkqubo ye-cardiovascular system, i-urinary system (ithulisa umchamo kwi-amniotic fluid), inkqubo ye-musculoskeletal, imiphunga kunye ne-bronchi sele iqalile, kodwa umenzi wesicacisa akayivelwanga. Ukuba umntwana ozelweyo, ngoko kwimeko yoncedo, amathuba okuphila angaphezu kwama-80%. Isikhundla se-fetus kwiveki yama-27 sinokutshintshwa kwaye isetyenziswe ngaphambi kokunikezelwa. Kule minyaka yobudala, umntwana ohamba ngezandla kunye neenyawo, adibanisa, aguqulwe amniotic fluid kunye ne-hiccups (ibhinqa ivakalelwa ukutshatyalaliswa kwamandla), inamathela ngomunwe. I-fetus kwiiveki ezingama-27 sele iqhuba ukunyakaza kokuphefumula (ukuya kuma-40 ukuhamba ngomzuzu).
Umsebenzi we-Fetal ngeveki 27
Umsebenzi we-Fetal kwiveki 27 kuxhomekeke kwizinto ezininzi. Ngoko, ukuguqulwa kwe-fetus kwanda ngoxinzelelo lwengqondo kunye nengqondo yomama. Ukwandiswa komsebenzi we-fetal kunokunxulumana ne-hypoxia (kunye nokungafihli komhlaba, ukusuleleka kwe-intrauterine ) -ukubonakaliswa kwayo kokuqala, kunye nokugqithiswa kwayo, ngokuchaseneyo, kunokunciphisa ngokukhawuleza.
Sibone ukuba kwiiveki ezingama-27 zokukhulelwa umntwana sele sele esebenzayo, uyakwazi ukwenza okuninzi kwaye ulungele ukuhlala kwindawo. Kulo thuba, i-metabolism kunye nokumelana nokunyamezela kuphelile.