Sezvakataurwa nemuzivi weGermany Ludwig Feuerbach: "Isu tiri izvo zvatinodya", uye munyaya ye fetus ichokwadi zvachose. Uye hazvirambike: muviri wedu unoumbwa nemamorekuru ezvinhu zvinobva muchikafu chatinodya zuva nezuva.
Mudumbu raamai, chibereko inogona kudya uye kufema nekuda kweiyo placenta. Aya ndiwo masvikiro anoita chikafu neokisijeni.
Kana ari mudumbu raamai, chibereko anogona kudya uye kufema kuburikidza neropa rinotenderera mumutsara wembilical, iyo inobva pa placenta. Kubva muchubhu iyi, inobatanidza mwana naamai, mwana anogona kugamuchira zvinhu zvaanoda kuti ararame, sokunge ari kudya uye kufema.
Mumwedzi mipfumbamwe yekuzvitakura, placenta inopa fetus kuenderera mberi kwekudya uye oksijeni uye inobvisa izvo zvisingadiwi nemetabolism yemucheche.
Zvokudya zvinosvika sei kumucheche?
Zvokudya zvinogona kusvika kumwana kuburikidza nechorionic villi, iyo inoumba chikamu che embryo che placenta. Iyo placenta inoumba, panguva imwe chete, chipingamupinyi chechikamu cheropa uye sefa yerimwe rasara, ndiko kuti, nokuda kwezvinhu zvinofanira kuchinjana pakati paamai nomwana ari mudumbu make, kubatanidza ma<em>hormone aamai nezvinorwisa utachiona.
Akapfuma mu<em>capillaries, anotora zvokudya zvinobva mutsinga dzeropa dzaamai. Nenzira iyi, mucheche anogamuchira zvokudya zvaanoda, achichipinza kubva mumuviri waamai. Nechikonzero ichi, zvakakosha kuti vakadzi vane pamuviri vachengetedze chikafu chine hutano uye chakadzikama, nekuti zvese zvinosvika mucheche zvine simba. mukukura kwavo uye utano.
Kunyange zvazvo zvisingabviri kunyatsoziva kuti inguva yakareba sei mushure mokunge chikafu chasvika kumwana, mishonga inokosha inowanzokurumidza kudyiwa nemucheche. Kuti unzwe mafambiro, vamwe amai vanodya zvinonaka. Izvi zvinodaro nekuti, kusiyana nemamwe macromolecules akaomarara, glucose inokurumidza kusvika kumucheche kuburikidza ne placenta uye ruvhuvhu.
Kufema kwefetus kunoitika sei?
Fetal kufema kunotanga kubva vhiki yegumi nembiri. Paanenge ari mudumbu, mwana anonyudzwa mumvura yeamniotic uye haasati akwanisa kufema akazvimirira kuburikidza nemapapu, ayo achange achingoshanda pakuzvarwa. Oxygen inosvika muchibereko kuburikidza ye placenta uye umbilical vein, kusiya ropa raamai, iro rinonyanya kukoshesa, uye richipfuura muropa re fetal iro, pane zvinopesana, rakashata zvikuru, rinopa carbon dioxide uye tsvina kune yekutanga. Yakave yakaratidzwa kuti kupiwa zvishoma kweokisijeni kunogona kunonoka kukura kwemwana uye izvo iyo placenta inonzwa kune nicotine: ndosaka zvichikurudzirwa kurega kusvuta panguva yekuzvitakura. Kusiyana neizvi, mabasa anoita kuti amai vafemere zvakanyanya, sekuti tamba mitambo kana kukwira masitepisiVanoita sechiitwa chine hutano kumwana.
Kutaura zvazviri, zvinganzi vacheche havafemi zvachose pavanenge vari mudumbu. Asi, kudya oksijeni uye zvimwe zvinovaka muviri, zvakadai sevhithamini nemapuroteni, kuburikidza neropa remumbilical.
Zvinotora nguva yakareba sei kuti chikafu chisvike kumwana?
Zvinoita sekuti kubva pavhiki yechisere yekuzvitakura mwana anenge achangozvarwa anopihwa kuravira, uye gare gare aya papillae anotanga kubatana neuropi, zvichikonzera kukura kwekunzwa kuravira.
Oxygen inosvika sei kumucheche?
"Fetus" inoda kugara ichipihwa okisijeni panguva ye "perinatal" nguva isati yasvika uye mushure mekuzvarwa. Oxygen iyi inopihwa naamai kuburikidza nerukuvhute neguvhu kusvika mwana azvarwa uye okwanisa kufema ega.
Chii chinopinda nemuguvhu?
Rukuvhute runobatanidza amai nemwana. Kuburikidza neropa riri mumutsara wembilical mwana anogamuchira zvokudya uye oksijeni munguva yose yekuzvitakura, pakupera kwepamuviri inenge 55 centimita kureba.