Izici zokuphefumula kwesisu
I-fetus yenza njalo ukunyakaza kokuphefumula. Ngesikhathi esifanayo, umcibisholo wezwi uvalwe ngokuqinile, okuvimbela amniotic uketshezi ukungena emaphashini. Izicubu ze-pulmonary azikavuthiwe, futhi ayinayo into ekhethekile ebizwa nge-surfactant. Yenziwa kuphela ngeviki 34, isb. ngaphambi nje kokuzalwa kwengane. Lesi sici sisiza ukuqinisekisa ukuphazamiseka kwendawo, okuholela ekuvuleni kwe-alveoli. Kuphela emva kwalokho, amaphaphu aqala ukusebenza, njengomuntu omdala.
Kulezo zimo lapho lesi sakhi singakhishwa, noma ingane ivela ngaphambi kosuku olufanele, umntwana uxhumeke kudivayisi yokuphuza umoya emaphashini. umzimba ngokwawo awukakwazi ukwenza umsebenzi wayo wokuqala wegesi.
Ukushintshaniswa kwegesi ku-fetus?
Ngisho nasemasontweni okuqala okukhulelwa, i-placenta ifaka odongeni lwe-uterine.
Kungenxa ye-placenta ukuthi i-oksijeni ephuma egazini lomama ingena emntwaneni. I-carbon dioxide eyakhiwe ngenxa yokushintshaniswa kwegesi, idlula indlela yokubuya, ibuyele emgodleni wegazi lomama.
Ngakho-ke, indlela ingane ephefumula ngayo esibelethweni sikamama incike ngokuphelele esimweni se-placenta. Ngakho-ke, ngokuthuthukiswa kwezibonakaliso zokuntuleka kwe-oxygen ebusweni, okokuqala, lesi sitho sihlolwa, senza i-ultrasound yayo.