Implantation and Early Development of the Blastocyst
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Questions and Answers

Which layer of the blastocyst enables it to penetrate the uterine lining?

  • Chorion
  • Cytotrophoblast
  • Endometrium
  • Syncytiotrophoblast (correct)

    • When does implantation of the blastocyst occur?

  • During the second week of development
  • 2 to 4 days after fertilization
  • 7 to 8 days after fertilization (correct)
  • 6 days after fertilization

    • What does the cytotrophoblast secrete?

  • Human chorionic gonadotropin (correct)
  • Estrogen
  • Follicle-stimulating hormone
  • Progesterone

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