# Zygote! How soon after do the other systems in the body become aware and change in embryogenesis?

**URL:** <https://boards.straightdope.com/t/zygote-how-soon-after-do-the-other-systems-in-the-body-become-aware-and-change-in-embryogenesis/817489>\
**Category:** Factual Questions\
**Created:** [July 7, 2018, 9:04pm UTC](https://boards.straightdope.com/t/zygote-how-soon-after-do-the-other-systems-in-the-body-become-aware-and-change-in-embryogenesis/817489 "2018-07-07T21:04:43Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![Leo\_Bloom](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/leo_bloom/32/10377_2.png) [@Leo\_Bloom](https://boards.straightdope.com/u/Leo_Bloom)\
**Post date:** [July 7, 2018, 9:04pm UTC](https://boards.straightdope.com/t/zygote-how-soon-after-do-the-other-systems-in-the-body-become-aware-and-change-in-embryogenesis/817489/1 "2018-07-07T21:04:43Z")

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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?

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**Author:** ![Arkcon](https://avatars.discourse-cdn.com/v4/letter/a/96bed5/32.png) [@Arkcon](https://boards.straightdope.com/u/Arkcon)\
**Post date:** [July 7, 2018, 11:56pm UTC](https://boards.straightdope.com/t/zygote-how-soon-after-do-the-other-systems-in-the-body-become-aware-and-change-in-embryogenesis/817489/2 "2018-07-07T23:56:59Z")

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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.

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**Author:** ![Leo\_Bloom](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/leo_bloom/32/10377_2.png) [@Leo\_Bloom](https://boards.straightdope.com/u/Leo_Bloom)\
**Post date:** [July 8, 2018, 12:42am UTC](https://boards.straightdope.com/t/zygote-how-soon-after-do-the-other-systems-in-the-body-become-aware-and-change-in-embryogenesis/817489/3 "2018-07-08T00:42:52Z")

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Unless I’m missing something, I don’t understand what you saying, with reference to OP. (And thanks for good ole’ gastrula.)

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**Author:** ![Broomstick](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/broomstick/32/246_2.png) [@Broomstick](https://boards.straightdope.com/u/Broomstick)\
**Post date:** [July 8, 2018, 8:43am UTC](https://boards.straightdope.com/t/zygote-how-soon-after-do-the-other-systems-in-the-body-become-aware-and-change-in-embryogenesis/817489/4 "2018-07-08T08:43:25Z")

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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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**Author:** ![TruCelt](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/trucelt/32/523_2.png) [@TruCelt](https://boards.straightdope.com/u/TruCelt)\
**Post date:** [July 9, 2018, 3:31am UTC](https://boards.straightdope.com/t/zygote-how-soon-after-do-the-other-systems-in-the-body-become-aware-and-change-in-embryogenesis/817489/5 "2018-07-09T03:31:36Z")

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Conceptus development and implantation:  
[![](https://en.wikipedia.org/wiki/Implantation_(human_embryo)#/media/File:Human_Fertilization.png) ](https://en.wikipedia.org/wiki/Implantation_(human_embryo)#/media/File:Human_Fertilization.png)

Uterine changes:

> **[Implantation (embryology)](https://en.wikipedia.org/wiki/Implantation_(human_embryo)#Adaptation_of_uterus)**
>
> Implantation (nidation) is the stage in the embryonic development of mammals in which the blastocyst hatches as the embryo, adheres, and invades into the wall of the female's uterus. Implantation is the first stage of gestation, and, when successful, the female is considered to be pregnant. In a woman, an implanted embryo is detected by the presence of increased levels of human chorionic gonadotropin (hCG) in a pregnancy test. The implanted embryo will receive oxygen and nutrients in ord There is...

Symptoms:

> **[Pregnancy Symptoms: 10 Early Signs That You Might Be Pregnant](https://www.webmd.com/baby/guide/pregnancy-am-i-pregnant#1)**
>
> Do you think that you or someone you know might be pregnant? Learn about these 10 early signs of pregnancy and find out what to do next at WebMD.

Now. Is there some happy news connected with this question? Or are you a few weeks away from being allowed to tell us, perhaps?

![](https://media1.tenor.com/images/e08bb13070e33902f322da570f8951a8/tenor.gif?itemid=5416705)