IGCSE Biology glossary
Implantation
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Definition
The process by which a developing embryo embeds itself into the thick, blood-rich lining of the uterus, approximately six to seven days after fertilisation. Once implanted, the embryo receives nutrients and oxygen from the mother's blood supply through the developing placenta.
What to include in an exam answer
Implantation occurs in the uterus wall (not the oviduct). It happens after the zygote has divided several times to form an embryo. The uterus lining must be thick and well-supplied with blood vessels for successful implantation.
Example in context
Describe what happens after fertilisation up to implantation (3 marks): After fertilisation in the oviduct, the zygote divides by mitosis to form a ball of cells (embryo). The embryo moves along the oviduct to the uterus. It implants (embeds) into the thick lining of the uterus wall.
Related syllabus topic
Reproduction