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- The release of the egg
- Ovulation
- The journey of the sperm
- This is when the ovary releases an egg . The egg is a reproductive cell that is large compared to other cells.
- Fertilisation
- Ovulation is the journey that the egg takes to reach the sperm. It travels down a tube that is known as the oviduct . They have tiny hairs attached to the walls of the oviduct that push the egg through the tube as the egg moves through it.
- Embryo Formation
- From the 200 million sperm that enter the vagina after an ejaculation, only 1000 sperm enter the oviduct. Only then 200 reach the egg but only one enters the egg to fertilise it.
- Implantation
- Fertilisation is the process which gametes (an egg and sperm) fuse to form a zygote.
- Cell division can only take place once the egg has been fertilised. This eventually form an Embryo.
- Implantation is where the the embryo adheres to the walls of the uterus. It stays attached to the walls until birth. This provides the developing embryo with oxygen and nutrients from the mother to be able to grow.
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