Fertilisation:
Fertilisation takes
place when the sperm unites with the egg.
The sperms enter
through the vaginal passage and travel upwards and reach the oviduct.
In the oviduct, one
of the sperms fuses with the egg and the fertilisation is completed.
Development:
Fertilisation
results in the formation of zygote.
The zygote divides
and redivides to form a ball of cells called blastocyst.
The blastocyst gets
implanted on the wall of the uterus and forms the embryo.
The embryo obtains
all the nourishment and oxygen from the mother’s blood.
A structure called
placenta present in the uterus supplies all the necessary nutrients to the
embryo through the umbilical cord.
The development of
the foetus takes place for nine months.
Birth:
When the baby is
grown completely, it begins to move down towards the vaginal passage.
The opening of the
cervix gradually opens, and the baby is released out through the vagina.
