After 8 weeks
In short, an embryo undergoes both cellular division and cellular differentiation to become a fetus. This is achieved by the genetic program present in the cell(s) which controls both mentioned processes. It is the stage of developing mammal.After 9th week of fertilisation,the embryo can be called foetus.
An embryo becomes a fetus at around 9 weeks of development.
The lungs do not play a direct role in nourishing the developing embryo and fetus. The placenta, umbilical cord, and amniotic fluid play key roles in providing nutrition and oxygen to the developing baby during pregnancy.
Placenta is the organ that provides mechanical protection and nutritional support for the developing embryo. It connects the developing fetus to the uterine wall to allow nutrient and waste exchange between the mother and the fetus.
The stage in the embryo called a fetus typically begins around the 9th week of development. At this point, the major organs have formed and the developing organism is referred to as a fetus until birth.
For the first 8 weeks the developing human is called an embryo after that it is called a fetus.
After the 8th week, the embryo is called a fetus.
In short, an embryo undergoes both cellular division and cellular differentiation to become a fetus. This is achieved by the genetic program present in the cell(s) which controls both mentioned processes. It is the stage of developing mammal.After 9th week of fertilisation,the embryo can be called foetus.
Fetus zygote is not the term to use. A zygote is a fertilized egg. An embryo is a developing baby. A fetus is a baby before it is born.
An embryo becomes a fetus at around 9 weeks of development.
The protective sac around the embryo or fetus is the amniotic sac.
In the seventh week of the embryo's development
Fetus
In humans, the embryo becomes the fetus at the beginning of the 11th week in gestational age (the 9th week after fertilization). This stage starts when the major structures have formed.
Gene combination and their expression in the embryo
zygote, blastocyst, fetus, embryo
The lungs do not play a direct role in nourishing the developing embryo and fetus. The placenta, umbilical cord, and amniotic fluid play key roles in providing nutrition and oxygen to the developing baby during pregnancy.