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The Biology of Prenatal Development




IBHAYOLOGI LEPHATSELENE NEKUKHULA KWEMNTFWANA LOSESESIBELETFWENI SENINA

.Siswati [Swati (siSwati)]


 

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Capítulo 41   4 a 5 Meses (16 a 20 Semanas): Resposta ao Estresse, Verniz Caseoso, Ritmos Circadianos

Emavikini la-16, tinchubo letifaka ekhatsi kufaka inyalitsi esiswini sefithasi kubangela kuphatseka kabi kwemahomoni lebese akhipha inoradrenalini, kimbe inorephinefrini, lengena engatini. Bantfwana labasandza kutalwa kanye nebantfu labadzala bakhombisa kuphatseka ngendlela lefanako nakukhona intfo lebafakwa yona ngekhatsi emtimbeni.

Eluhlelweni lwekuphefumula, sihlahla semphimbo nyalo cishe sesiphelele.

Nyalo kukhona intfo lemhlophe lesivikelo, lebitwa ngekutsi yiveniksi khasiyosa, lembonye ifithasi. Iveniksi ivikela sikhumba kutsi singaphatfwa kabi ngemantana e-amniyoni.

Kusukela ku-19 wemaviki kunyakata kwefithasi,kuphefumula, kanye nesivinini sekushaya kwenhlitiyo kucalisa kulandzela luhlelo lunye lwamalanga onkhe lolubitwa gekutsi sigci sesikhatsi lesilinganako.

Capítulo 42   6 a 7 Meses (24 a 28 Semanas): Reflexo Cócleo-Palpebral e de Sobressalto; Pupilas Respondem à Luz; Olfato e Paladar

Emavikini la-20 indlu yendlebe, lekusitfo sekuva, sesilingana nesemuntfu lomdzala ngebukhulu ngekhatsi kwendlebe yangekhatsi leseyiphelele kukhula. Kusukela nyalo, ifithasi itawukhombisa kuva tinhlobo temisindvo letiya ngekwandza.

Tinwele tiyacalisa kumila esikhunjeni sasenhloko.

Tonkhe tincwencwe tesikhumba kanye netakhiwosetikhona, kufake ekhatsi timbonjana teboya esikhunjeni kanye nemadlala.

Emavikini la-21 kuye kula-22 ngemuva kwekwakheka kwembewu yemuntfu, emaphaphu ayakhona kuphefumula umoya. Loku kutsatfwa njengebudzala lobucinile ngobe ngalesikhatsi lesi ematfuba ekuphila ngaphandle kwesibetfo aba makhudlwana kumafithasi latsite. Inchubekelembili lendze kutekwelapha lefike ngekulandzelana yenta kutsi kube yimphumelelo kutsi tikhone kuphila tinswane letitelwe ngembikwesikhatsi.