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Question
Explain the phases in embryonic development from the morula stage till the establishment of pregnancy in a human female.
Solution
- The embryo with 8 to 16 blastomeres is called a morula.
- The morula continues to divide and transforms into a blastocyst as it moves further into the uterus.
- The blastomeres in the blastocyst are arranged into an outer layer called trophoblast and An inner group of cells attached to the trophoblast is called the inner cell mass.
- The trophoblast layer then gets attached to the endometrium, and the inner cell mass gets differentiated as the embryo.
- After attachment, the uterine cells divide rapidly and cover the blastocyst.
- As a result, the blastocyst becomes embedded in the endometrium of the uterus. This is called implantation and it leads to pregnancy.
Fertilisation and passage of growing embryo in the fallopian tube.
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