Early embryogenesis and maternal recognition of pregnancy

4 important questions on Early embryogenesis and maternal recognition of pregnancy

What are the four steps that need to be achieved before the embryo can attach to the uterus?

  1. Development withing the confines of the zona pellucida
  2. Hatching of the blastocyst from the zona pellucida
  3. Maternal recognition of pregnancy
  4. Formation of the extraembryonic membranes

What is a zygote?

A singe-celled embryo

What is a blastomere?

A two-celled embryo, after the first cleavage division

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Which forces govern the hatching of the blasocyst? (3)

  • growth and fluid accumulation within the blastocyst
  • production of enzymes by the trophoblastic cells
  • contranciton of the blasocyst

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