The blastocyst embeds in the uterine lining about a week after fertilisation.
The blastocyst hatches from the zona pellucida, trophoblast invades the endometrium and secretes hCG. The endometrium forms the decidua. Failure leads to early pregnancy loss.
Implantation involves attachment, invasion and decidualisation. Failure of implantation is a cause of infertility. Early pregnancy hormones signal pregnancy.
Example: hCG is detected by pregnancy tests.
The blastocyst embeds in the uterine lining about a week after fertilisation.
Implantation is one of the 54 topics in Reproduction & Endocrinology. It is rated Intermediate, so it suits learners who already know the core vocabulary. Related topics in this area include Contraception, Menstrual Cycle, Zona Pellucida and Egg Activation.
IUDs and emergency contraception can prevent implantation or fertilisation.
Work through the Beginner topics in Reproduction & Endocrinology first, such as Reproduction, Asexual Reproduction, Sexual Reproduction, then return to Implantation. Intermediate topics assume the Beginner vocabulary.
The closest topics to Implantation are Contraception, Menstrual Cycle, Zona Pellucida and Egg Activation, Pregnancy Hormones. Comparing them side by side is a good way to see how the ideas connect.
Read the summary and the in-depth section, then use the quick check on the interactive lesson for Implantation. To practise the whole of Reproduction & Endocrinology, use the Reproduction & Endocrinology quiz.
Implantation: The blastocyst embeds in the uterine lining about a week after fertilisation. Contraception: Methods that prevent pregnancy, including barriers, hormones and sterilisation. Read both side by side and note what each one explains.
First, read the summary and write the definition in your own words. Second, read the in-depth section and note any example. Third, compare it with Contraception and explain the difference aloud. Finally, take the Reproduction & Endocrinology quiz and come back to this page for any question you miss.
Methods that prevent pregnancy, including barriers, hormones and sterilisation.
🌸 Reproduction & EndocrinologyA roughly 28-day cycle in which the uterine lining builds and sheds in response to hormones.
🌸 Reproduction & EndocrinologyEgg coat proteins bind sperm and calcium waves activate development after fusion.
🌸 Reproduction & EndocrinologyhCG maintains the corpus luteum early on, then the placenta produces progesterone and oestrogen.
🌸 Reproduction & Endocrinology