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: If '''implantation''' does not occur the [[embryo]] is aborted by the [[uterus]].
: Following '''implantation''' the [[tissue]] surrounding the [[embryo]] becomes the [[placenta]] and [[amnion]].
==Key Stage 4==
===Meaning===
'''Implantation''' is when an [[embryo]] sticks to the wall of the [[uterus]] and is surrounded by [[tissue]] from the lining of the [[uterus]].
===About Implantation===
: If '''implantation''' does not occur the [[embryo]] is aborted by the [[uterus]].
: Following '''implantation''' the [[tissue]] surrounding the [[embryo]] becomes the [[placenta]] and [[amnion]].
: Following [[fertilisation]] '''implantation''' can be prevented by [[contraception|contraceptive measures]] including:
:*The [[Intrauterine Device]] - Already present in the [[uterus]] prior to [[intercourse]].
:*The morning after pill - Taken after [[intercourse]] in which a another [[contraception|contraceptive measure]] either failed or was not used.