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?
- Development withing the confines of the zona pellucida
- Hatching of the blastocyst from the zona pellucida
- Maternal recognition of pregnancy
- 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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