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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: Wanneer die eerste bloedselle in die dooiersak verskyn, begin bloedvate dwarsdeur die embrio vorm, en verskyn die buisvormige hart.

Byna onmiddellik begin die vinnig-groeiende hart inmekaar vou, soos afsonderlike hartkamers begin ontwikkel.

Teen 3 weke en 1 dag na bevrugting begin die hart klop.

Die bloedvaatstelsel is die eerste liggaamstelsel, of verwante groep organe, wat 'n werkende toestand bereik.

All ages referenced to fertilization, not last menstrual period.
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Early Embryonic Development
Early Embryonic Development
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Human Development
Heart and Circulatory System
Heart and Circulatory System
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