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The Endowment for Human Development
The Endowment for Human Development
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Heart and Circulatory System


3 weeks

From The Biology of Prenatal Development.Buy Now

Script: Njengoba amaseli weengazi athoma ukuvela ngaphakathi komgodlana womthubi, imithambo yeengazi yakheka ku-embryo yoke, begodu nehliziyo elitjhubhu ithoma ukuvela.

Kungasi kudala, ihliziyo ekhula njalo iyabhincana ngokwayo njengendlwana eyodwa ithome ukuvela.

Ihliziyo ithoma ukuphefumula Emva kweemveke ezi-3 nelanga elilodwa ngemva kokumumatha (fertilization).

Ihlelo lokukhambisa iingazi lihlelo lokuthoma lomzimbha, noma isichema samalunga ahlobeneko, ukufikela isikhathi sokusebenza.

All ages referenced to fertilization, not last menstrual period.
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