Fertilisation and implantation
From zygote to foetus.
Where do they meet?
Sperms enter the vagina. The egg is in the oviduct.
Where do you think the sperm and egg can meet?
What this lesson covers
The idea
Sperms entering the vagina travel up to the oviduct, where they may fertilise the egg; the zygote divides into an embryo, which is implanted in the thickened, blood-rich lining of the uterus and develops into a foetus.
Where do they meet?
Sperms enter the vagina. The egg is in the oviduct.
Where do you think the sperm and egg can meet?
- In the oviduct
- In the ovary
- Outside the body
From sperm to foetus
Press Next step. This is a schematic diagram.
Meeting and settling
The sperms travel up to the oviduct and may fertilise the egg there. The zygote divides to make a ball of cells, the embryo. The embryo settles in the lining of the uterus, which is thick and full of blood, and grows into a foetus.
Sperms entering the vagina travel up to the oviduct, where they may fertilise the egg. The zygote divides into an embryo, which is implanted in the thickened, blood-rich lining of the uterus and develops into a foetus.
Notes
Sperms travel to the oviduct; the zygote divides into an embryo, which is implanted in the thick, blood-rich uterine lining and develops into a foetus.
Check yourself
Where may the sperms fertilise the egg?
What does the zygote become when it starts dividing and forms a ball of cells?
Where is the embryo implanted?
- In the vagina. The sperms enter through the vagina but travel upwards to the oviduct, where they may meet the egg.
- In the oviduct — correct. Yes!
- In the cervix. The sperms travel up to the oviduct, where they may encounter the egg.
- A foetus at once. The ball of cells is the embryo. It develops organs and becomes a foetus later.
- An egg. The egg is made in the ovary. The zygote divides to form a ball of cells, the embryo.
- An embryo — correct. Yes!
- In the lining of the uterus, which is thickened and rich in blood — correct. Yes!
- In the wall of the oviduct. The book says the embryo is implanted in the lining of the uterus.
- In the ovary. The ovary produces the eggs. The embryo is implanted in the lining of the uterus.