I don’t think I skipped this class in Health Ed. Zygote–>morula (did I miss a step?)–>blastocyst–>embryo.
The woman’s body obviously goes through enormous changes at the local and systemic level during early pregnancy. I presume there must be novel chemical interactions and signaling to the rest of the body after that moment of conception. What are they, and in what rough chronological sequence–down to the level of seconds or less?–and what are the first responses in the “rest of” the body, as the media is alerted to the news of a zygote in the zona pellucida?
The changes a placental mammal’s body undergoes are directed by implantation.
The definitions of embryo, zygote, blastocyst, and you forgot gastrula are common to all development, and don’t connect necessarily with implantation. I mean to say, chickens do all of those and more, in a shell, and don’t implant in the mother.
You can look up the effects of implantation on a placental mammal. There are many many steps.
He’s saying that the chemical signalling to the mother’s body does NOT take place at the “moment of conception”, it takes place when implantation in the wall of the mother’s uterus takes place.
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