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The Endowment for Human Development
The Endowment for Human Development
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Multilingual Illustrated DVD [Tutorial]

The Biology of Prenatal Development




IBHAYOLOGI LEPHATSELENE NEKUKHULA KWEMNTFWANA LOSESESIBELETFWENI SENINA

.Siswati [Swati (siSwati)]


National Geographic Society This program is distributed in the U.S. and Canada by National Geographic and EHD. [learn more]

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The 8-Week Embryo

Chapter 30   8 Weeks: Brain Development

Emavikini la-8 ingcondvo seyakheke kakhulu imphela futsi isindza cishe ihhafu yesisindvo semtimba we-embriyo sesiphelele.

Kukhula kwenteka ngelizinga lelisetulu ngendlela lemangalisako.

Chapter 31   Right- and Left-Handedness

Emavikini la-8, 75% wema-embriyo abonakala sandla sekudla kungiso lesinemandla kakhulu. Lamanye ema-embriyo hhafu yawo inemandla kakhulu esandleni sesincele,kutsi lelenye ihhafu tandla totimbili tilingane ngemandla. Lobu bufakazi bekucala bekutsi umuntfu utawusebentisa siphi sandla.

Chapter 32   Rolling Over

Tincwadzi tekufundzisa ngetemphilo yebantfwana tichaza likhono lekukwati "kugucuka" kutsi kwenteka ku-10 kuye ku-20 wemaviki umntfwana atelwe. Nobe kunjalo, lelikhono lelibabatekako,lekukwati kunyakata libonakala umnftwana angakatalwa asesekulendzawo lapho kungekho emandla emhlaba ladvonselana phansi esikhwameni se-amniyoni lesigcwele emantana. Kweswelakala kuphela kwemandla ladzingakalako lenta umuntfu akwati kwehlula emandla emhlaba ladvonselana phansi langaphandle kwesibeletfo lokuvimbela bantfwana labasandza kutalwa kutsi bakwati kugucuka.

I-embriyo iya ngekuya ikhutsala kunyakata ngalesikhatsi lesi.

Kunyakata kungahle kutsatse Sikhatsi kumbe kwenteke masinyane, kube kanye kumbe kanyenti, kutentakalele kumbe kubangelwe ngulokutsite.

Kugucula inhloko, kwelula intsamo, kanye nekutsintsa buso ngesandla sekuvame kakhudlwana kwenteka.

Kuyitsintsa i-embriyo kubangela kutsi ififiyele, kunyakata kwemihlatsi, kunkhonkhoshela ngetandla, nekweleka kwetintwane.

Chapter 33   Eyelid Fusion

Emkhatsini wemaviki la-7 na-8, lujwabu lwemehlo lolungenhla nalolungentasi luyakhula masinyane luvale emehlo futsi lucishe lunamatselane ngci.

Chapter 34   "Breathing" Motion and Urination

Ngisho naloku kungekho umoya esibeletfweni, i-embriyo ibonakalisa kunyakata lokufana nekuphefumula emavikini la-8.

Ngalesikhatsi lesi, tinso tikhipha umchamo lophumela emantaneni e-amniyo.

Kuma-embriyo lamadvuna, emasendze lakhekako acalisa kukhicita kanye nekukhipha ithestosteroni.

Chapter 35   The Limbs and Skin

Ematsambo, emalunga, imisipha, imiva, kanye nemitsambo yengati kwetitfo temtimba kufana kakhulu nekwemuntfu lomdzala.

Emavikini la-8 i-ephidemisi, kumbe sikhumba sangaphandle, siba yinyamana letsambile letincwencwe letinyenti, lengasabonakalisi ngale.

Tinkhophe tiyakhula njengaloku kucalisa kuvela boya lobukake umlomo.

Chapter 36   Summary of the First 8 Weeks

Emaviki lasiphohlongo aluphawu Lwekuphela kwesikhatsi se-embriyo.

Ngalesikhatsi lesi, i-embriyo yemuntfu seyikhule kusuka ekubeni yinhlayiya yinye yaba nguletinhlayiya cishe letisigidzi lesisigidzi letakha ngetulu kwa-4,000 wetakhiwo temtimba letingafani.

Nyalo i-embriyo inetakhiwo letingetulu kwa-90% taleto letitfolakala ebantfwini labadzala.


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