ʻO ka placenta he'ōpena pilikino e pili ana i ka makuahine a me ka'ōpiopio. Aia ia i loko o ka membrane mucous o ka pūpū, ma keʻano ma kona kua hope, akā e like paha kona kūlana. Ma hope o ka hānauʻana o ke keiki, hele ka placenta ma hope ona, ma hope o nā minuke.
He paʻakikī ka nui o ka placenta i ka hoʻonāukiuki - mālama ia i ka pēpē, hoʻololi i ka oxygen i ia mea a hōʻike i nā huahana o ka hana nui. Ināʻole, he hikiʻole ke noʻonoʻo i ka'ōpū, no ka mea, he mea nui ia no ka'ōpū hānau. E aʻo hou ana mākou i keʻano a me nā hana o ka placenta?
ʻO keʻano o ka placenta
ʻO ka placenta he maha nā papahana, no laila ua'ōleloʻia konaʻano heʻano hoʻomauhonua o ka placenta. ʻO kēlāʻano iʻikeʻia e ka papa. No laila, ka mōʻaukala placental mai ka hānai i ka makuahine:
- amnion - synthesizes amniotic fluid a hoʻolaha iā lākou;
- ka stroma - he pilina pili, aia nā moku a me nā pūnaewele o ka microphage - Kashchenko-Gofbaur;
- Cytotrophoblast - nā pūnaewele e hoʻokumu syncytia, e hūnā i ka BAC;
- syncytiotrophoblast - hauhoehoeer symplast, uhi i ka cytotrophoblast;
- lacunae - ua piha i ke koko;
- nā trophoblast - uhi lacunes, e ulu i nā paia o nā'eneʻeneʻe loea a pale i ko lākou kū'ēʻana;
- fibrinoid - kapa 'ia' o ia ke 'ano Lantgans;
- decidua - endometrium me nā pūnaewele decylulus waiwai nui.
Nā hana kumu o ka placenta
ʻO keʻano a me nā hana o ka placenta ua pili pū. E pāʻani ana kēlā me kēia papa o ka placenta i ka hana i hāʻawiʻia iā ia, ma muli o ka hopena, ke hana nei ke kino i nā hana koʻikoʻi nui:
- oxy oxy - komo ke oxygen i loko o ka pēpē, a ua laweʻia ka carbon dioxide mai iaʻaoʻao ma kahiʻaoʻao'ē aʻe;
- ka meaʻai - hiki ke kiʻi i ka'ōpena i nā meaʻai e pono ai
waiwai. ʻO ke kaumaha,ʻo ka nicotine, ka waiʻona a me nā lāʻau a pau e hele i loko o kahi pale pale a komo i ka pēpē. Hāʻawi pū ka placenta i nā huahana o ka'ōpiopio; - Ka palekana Immunological - ke hoʻopiʻi ka placenta i nā pūnaewele kūponoʻole o ka makuahine,ʻoiai, i ka wā e hiki ai i ke keiki hānai, manaʻoʻiaʻo ia he mea'ē aʻe a ho'āʻo e hoʻokuke iā ia. I kēlā manawa hoʻokahi, laweʻia e ka placenta nā mea'iliane e pale i ka'ōpū mai nā maʻi;
- keʻano o nā hormones - ke pāpale placenta keʻano o kaʻeha endocrine, synthesizing i nā hormones o ka hCG, ka prolactin, ka lālā placental a pēlā aku. Pono lākou no ka'ōnaehana maʻamau o ka'ōpū a me ka uluʻana o ka hānai.