<Table> <Tr> <Th colspan="2"> Heart development </Th> </Tr> <Tr> <Td colspan="2"> Development of the human heart during the first eight weeks ( top ) , and the formation of the heart chambers ( bottom ) . In this figure , the blue and red colors represent blood inflow and outflow ( not venous and arterial blood ) . Initially , all venous blood flows from the tail / atria to the ventricles / head , a very different pattern from that of an adult . </Td> </Tr> <Tr> <Td colspan="2"> Anatomical terminology ( edit on Wikidata ) </Td> </Tr> </Table>
<Table> <Tr> <Th colspan="2"> Heart development </Th> </Tr> <Tr> <Td colspan="2"> Development of the human heart during the first eight weeks ( top ) , and the formation of the heart chambers ( bottom ) . In this figure , the blue and red colors represent blood inflow and outflow ( not venous and arterial blood ) . Initially , all venous blood flows from the tail / atria to the ventricles / head , a very different pattern from that of an adult . </Td> </Tr> <Tr> <Td colspan="2"> Anatomical terminology ( edit on Wikidata ) </Td> </Tr> </Table>
when is a heart formed in a fetus
when is a heart formed in a fetus
during the first eight weeks
during the first eight weeks