Biology
How does a single-celled fertilized egg grow into an adult in human body?
Reproductive System
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Answer
The fertilized egg starts developing and by the time it reaches to the uterus from the Oviduct, a small ball of numerous cells is already formed. This is called the embryo. The embryo forms a pit in the wall of the uterus and gets fixed in it. This process is called implantation and it produces the state of pregnancy. The embryo keeps growing in the uterus and specialisation of cells starts, leading to the formation of different parts of the body. This whole process is called differentiation.
By the end of five weeks of pregnancy, the embryo has developed the heart and circulatory system. It is known as foetus now. After two months limbs are also formed. Foetus develops in the uterus for about 280 days. This time period is called gestation. After gestation, birth of the baby happens. The baby is pushed out by the powerful contractions of the muscles of the uterus through the vagina.
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