0:00
All right.
00:01
So for this question, we're going to look at three of the stages of development, starting after fertilization and conception to the fetus, the fetal stage.
00:10
We need to talk about how this developing waveform is going to get its nutrients.
00:13
What's going to be its source? so i've numbered them one through three.
00:16
And let's start at the latter end, the more developed part, the fetus, or the fetal stage.
00:20
Because we're probably more familiar with the source of nutrients and then things will get a little bit nuanced or, let's just say maybe something you're not as familiar with as we go to the earlier stages.
00:30
So the fetal stage, right? things are going to take more shape.
00:34
We're going to have more organs being developed or in the process of being developing.
00:41
So we're going to have more organs that are going to be forming and getting more sophisticated and develops.
00:46
Because the cells and the tissues are a little bit more differentiated than there would be an embryonic stage.
00:51
So in this instance, we need to grow these organs, these organ systems, and make a fully functioning later baby.
00:59
So in order to fuel this process, we need to get nutrients via the umbilical cord, umbilical cord, which connects the baby, the fetus, specifically.
01:11
Let's try and be more concise with our language.
01:13
The fetus is the correct term here, to the placenta, where the mother's blood can be exchanged with the babies in order to transfer and give glucose and other nutrients.
01:29
Don't need to get too specific.
01:31
Glucose is sugar to just fuel, right, and other nutrients that might need to survive and develop in a healthy manner.
01:39
And they can also take away.
01:41
So this will be going to the fetus and then i'll also to the placenta, take away the waste to the placenta that the mother can deal with for the baby, the fetus.
01:52
Sorry, i did it again, guys.
01:53
My apologies.
01:54
So that's the source here.
01:55
The source is just going to be the umbilical cord, which we're probably familiar with.
02:00
You have to ever during childbirth because at that point was still connecting the baby or the fetus now baby to the mom.
02:09
Sorry, the language is getting a little confusing again so that it could still get its nutrients via the placenta and the bloodstream of the mother, the host.
02:18
So let's move on to the embryo now.
02:21
So in the embryo, things are starting to become more specific and more differentiated from one another.
02:28
This lasts until about the eighth week of development, in case you're wondering, the eighth week, just for a little bit of context after conception.
02:36
And we have the three layers of that we'll talk about the preembrionic stage, three layers, and they continue to divide and differentiate.
02:45
So we're growing, we're getting more cells, things like mitosis, and then we're differentiating, meaning that they're going to become more specific to develop into different tissues.
02:55
That's why we think about these, embryonic stem cells because the tissues aren't necessarily differentiated.
03:01
They can become anything at this point, a lot of them, the embryonic stem cells that are.
03:07
So anyway, because of this, they're dividing and differentiating.
03:11
So things are growing a little bit more exponentially than the preembrionic stage.
03:16
So because of this, we definitely need some nutrients to nourish the embryo...