zygote - it is formed after a sperm fertilises an egg, embryo - when a zygote implants in the uterus ____ forms, placenta - the organ that develops during pregnancy to provide oxygen and nutrients to the embryo, umbilical cord - connects the placenta to the embryo in order to transport oxygen and nutrients, amniotic sac - it is filled with fluid to protect the foetus, foetus - at the end of the first term the embryo becomes..., labour (parto) - at the end of the pregnancy the cervix dilates and the baby is pushed out, 40 weeks/9 months - the general duration of a human pregnancy, contractions - rhytmical movements of muscles in the uterus that push the baby out, fertilisation - the union of a sperm and an egg/ovum,

Fertilization, pregnancy, and birth

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