1Puberty
When changes associated with sexual maturity occur
2Menstrual cycle
A series of changes in women, where an egg is released about every 28 days
3The fertile period
The time during the menstrual cycle when fertilisation is most likely to occur
4Sexual intercourse
Sperm are released from the erect penis by ejaculation. The sperm swim through the cervix, up the womb and into the fallopian tubes to fertilise an egg
5Fertilisation
Fusing of a male gamete with a female gamete to form a zygote
6Implantation
The process by which the embryo attaches to the womb lining
7Placenta
An organ formed by both the baby and the mother, allows substances to pass between them
8Umilical cord
Connects baby to placenta
9Contraception
Methods used to prevent or space out pregnancies