Q:

Which of the following components plays the most active role in invading the endometrium during blastocyst implantation?

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Which of the following components plays the most active role in invading the endometrium during blastocyst implantation?


  1. Epiblast
  2. Syncytiotrophoblast
  3. Hypoblast
  4. Extraembryonic somatic mesoderm
  5. Extraembryonic visceral mesoderm

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B. The syncytiotrophoblast plays the most active role in invading the endometrium of the mother’s uterus. During the invasion, endometrial blood vessels and endometrial glands are eroded and a lacunar network is formed.

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