domingo, 6 de febrero de 2011

Our reproductive system









HOW WE REPRODUCE
In human reproduction there are three processes:
fertilization, pregnancy and childbirth.
Fertilization is the union of a sperm and a matura ovule, which produces a zygote.
Pregnancy is the period when the zygote becomes the embryo, and the embryo
develops inside the mother's uterus.
Chilbirth is when the baby leaves the mother's body.