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Number these events in human development in the correct order.
_____ gastrulation is completed _____ blastocyst forms _____ tail is reabsorbed _____ implantation occurs _____ zygote forms _____ neural tube forms _____ maternal cervix softens

Let's walk through some of the steps of human embryo Genesis. So this is going to be about the first eight weeks of development after fertilization. So fertilization is when a sperm cell in an egg cell fuse and that is going to form AZ. Coach. This zygote is going to undergo cleavage in the 1st 12 to 24 hours, which is very, very rapid cell division. No, all of these cells are going to take their divide so quickly they're not going to have time to grow. So they're going to divide in half and then half and then half again. So you're going to start with the zygote divide in half to divide again. Four. Divided in half again eight and again 16 and again 32. And when you hit the 32 cell stage, this is going to be known as the Morua, and the gorilla is going to be the same size as the psycho. Because again we said everything is divided so quickly they didn't have time to grow. So at this point, the zona pellucida, which is the protective membrane that surrounds the egg cell before fertilization, um, is going to start disappear and continue on dividing, so the next step is going to be blast relation. So around day four, those cells are going to continue to divide. Um, but they're also going to be start to differentiate and develop more specific forms and specific functions. So, um, they're going to move toward a certain path to become like an eyeball cell or a kidney cell. So two layers are going to develop an outer shell known as the truffle blast, and in a collection of cells called the inner cell Mass. So here it's the truffle blast. Here is the inner cell mass, and they're gonna collect on one side like that. So they're gonna be pushed off to one side of that sphere formed by the trough, a blast and the rest of this fluid filled cavity. This green representation here is going to be called a blaster sale. Yeah, And so the outer travel blast is going to develop into structures that are going to help the growing embryo implant in the mother's uterus and the inner cell mass. That red representation will continue to differentiate, and parts of it are going to eventually become the embryo. So it's sometimes called the embryo blast. And again, Like I said, this is where that zona pellucida is going to be disappeared, and it's going to allow this ball of cells, which is now called a blastocyst, to grow and change shape. So blastocyst formation mhm. See if we can't make that t behave. There we go plaster system. So at this point, that inner cell mass um, those cells are going to be pluripotent. That means they can eventually turn into the cells of any body tissue. And during the second week, these cells are going to differentiate even further into an epic blast and a hyper blast. And those are going to be two layers of the by laminar disk. This disc is pretty much a flat slice across the developing sphere, and it's going to split the environment into two cavities. Um, so if you imagine a balloon expanding on two sides, um, there's going to be the hyper blast, which is the layer facing the blast. A seal and the EPA blast is going to be on the other side. So, like I said, imagine two balloons expanding side by side. They're going to expand to fill the space and become the two cavities, which is one side is gonna be the primitive yolk sac on the side of the hyper blast. And the amniotic cavity is going to be on the side of the EPA blast. And the amniotic cavity is what will eventually surround the fetus. So we have had the zygote into the blast chiller into the blast and the hyper blast. So the or the hyper blast doesn't really contribute to the embryos. We're going to focus on the EPA blast. So now we are going to move on to the next step, which is gas relation. You're gonna attempt to write it. All right, try a different spot. There is a gas relation. Gotta love technology. All right, this is going to be week three of development. Um, there's going to be three germ layers that form and the cell masses now known as a gastro rula. So, gas trulia, There we go. So a germ layer is basically a layer of cells that's going to go on to form one of our organizational tubes. So we're going to have an extra term end of term and a miss a term so the ectodermal is going to eventually form our epidermis, our outer layer of skin. It's also going to form our hair, our nails, our brain, our spinal cord and peripheral nervous system. The end of a term that green there is going to form the epithelial lining of the digestive tract. It's also going to form our stomach or colon, liver, pancreas, bladder and lungs. And the missile Durham, represented by the color red there, is eventually going to form muscles. Bone connective tissues are not accord Kidney's gone adds, if applicable, and the circulatory system. So after gas relation, we are going to undergo no relation. So during gas relation, uh, there's going to be the formation of a primitive streak just going to be right here. And this is what's going to orient our body, um, from the head end to a rear end and divide us because we are daughter stones. There's a point where you can divide our bodies and we're going to have mirror images are right on the left side. So, um, that primitive streak is going to be moving cells. It's going to be moving from the EPA blast, and it's going to move down. So between the original EPA blast and the hyper blast layer are going to be separated and eventually directly beneath that primitive streak. The miss a term that middle germ layer is going to form a thin rod of cells known as the nodal cord. Down here. Um, the note accord is what's going to help define the major axis of our bodies. And it's important in inducing the next step where we start to make tubes. So no relation, thank you, no relation. There we go. So tubes are going to form making nirula, and the note accord is going to induce the formation of the neural plate. The neural plate is going to fold in on itself to make the neural tube and neural crest. So now that we have cell layers, it's time to make that Final three D Prod product. And the first step is going to be rolling to create the note accord. The note accord is going to cause the ectodermal above it to form a thick, flat plate of cells called the neural plate. This plate extends the entire length of the rostrum, coddle access or head to tail access the neural plate is going to bend back on itself and seal itself into a tube, the neural tube, and that's going to fit underneath the Ecto Durham, which is the outer layer. Um, the borders of where the neural plate had been are going to get pulled under with it, and that's going to become the neural crest. That neural tube is going to become the brain and the spinal cord and that neural crest. Um, sometimes it's called the fourth germ layer. Uh, it's going to form the sympathetic and parasympathetic nervous systems melanocytes, Schwann cells, um, and even the bones and connective tissue in the face. Now, the missile Durham, uh, is going to be subdivided into Axle, Parexel intermediate and lateral plate. Miss Adams. Uh, no to court is going to come from the axle. Mr Durham and the other Mr Terms are going to form different parts. So the end of term is gonna be rolling into a tube as well. And that's going to be like you said the digestive tract, Um, the Forgot mega and hind gut. Each subdivision is going to have its own nerve and blood supply, and it's going to give rise to the esophagus, the stomach and part of the duodenum. So after all of these have gone down, we are going to move on and form the pharyngeal arches. It was all right, and we'll draw a very crude drawing. Humans have six, but I'm just going to draw three little I. Excuse me. So these pharyngeal arches they're also known as visceral arches are structures seen in embryonic development in humans and their recognisable precursors for many different structures. So in the human embryo, the arches are first seen during the fourth week of development. They are going to appear as a series of out pouch ing's of miss a term on both sides of the developing pharynx. And the vasculature of these arches is also known as the aortic arches. So invertebrates again, those pharyngeal arches are going to be derived from three germ layers. Neural crest cells are going to enter these arches where they contribute to the features of the skull and facial skeleton. Um, like bone and cartilage. And the first most interior pharyngeal arch is going to give rise to the jaw. So there's going to be the jaw. The second is going to be calm the hyoid and the jaw support and eventually move on into other forms. So each arch is going to develop its own artery and nerve that control the distinct muscle group in skeletal tissue. Um, again, we have 61 is going to be the arch closest to the head of the embryo, and the arch five is going to exist. Only transient Lee Ah, they're going to grow and join in the ventral midline right there. The first arch. It's going to separate the mouth pit or the storm odium from the pericardium. And by differential growth, the neck is going to elongate, and new arches are going to form so that the pharynx will have six arches ultimately, and we can discuss the arches further on. So just to walk through, um, all those steps in order again, it's going to be zygote formation. Merola formation. The blastocyst is going to form. Then gas relation, then neural tube formation and then pharyngeal arches are going to form

Hey, everyone, it's Katie here. So today we're going to be looking at Ah, this question. And when I get any question, the first thing I like to do is identify what it's asking me. So we can say the gold for this question is that I identify result, uh, gassed relation. I'm capitalizing batch relation for a reason, because this is really the key word of this question. If you don't know what gas relation is, you're gonna have a difficult time trying to find the right answer on and getting the right answer. So we're gonna take a couple steps back on, and really, the final calculation is, and make sure that you guys understand what that word means and what it's relating to before we look at the answer choices. And before we really figure out, um, what the right answer is here. So, uh, something that I want you guys to connect gas relation with If you don't already, you should be connecting gas relation with embryonic development. And if we take a step even further back, um, we talk about em breed embryonic development when we're talking about sexual attraction. Oh, no, sorry. Guys. Do that quickly. So you have to wait a little bigger. Awesome. So something that, um I think it's helpful when you see the word embryonic development. You see the word every all right, inside embryonic. So that's a good hand to know that we're talking about sexual reproduction here. And obviously development is, um referring to the growth and, um, the advancement of the embryo in this case. So when we talk about sexual reproduction, we're really talking about here, Um, happen, Lloyd Sperm. So and 1/2 Floyd. Thanks. So, forming a zai Go on, that is fertilization. So that's one of my about sexual reproduction. Talking about embryos were talking about the fertilization of, um, an egg cell with a sperm cell to form a zygote, which is then going to become an embryo. Hopefully, that makes sense for you guys. So when we're talking about embryonic development, there are three stages that we need to be able to identify. The first stage is called cleavage. The second stage is called gas relation. The third stage is called Oregon or, you know, Dennis is so after writing that there is something that you should immediately notice. I are key word that I told you we need to be able to define is actually on our screen right now. So we can say clearly and definitively that, um, gas relation is the second stage of embryonic development. I want to dive just a little deeper into these stages just so that you guys have a very clear understanding of embryonic development and what that really entails. So, like I said, in the last wide after fertilization happens, we have the psycho, which is both Hap Lloyd cells coming together to form one deployed. So that's ours. I go so immediately after that that cell is going to start dividing, right? Because in order, Teoh produce an embryo, produce a fetus. If we're talking about humans, you need a lot. A lot of cells billions and billions of cells were talking about. So that starts with cleavage. So within cleavage, um, that zygote is going to replicate. Divide on at the end of cleavage, we're gonna have something called Blast you up on the glass. Steagall Last ula sorry can be defined as a fluid shelled wallets outs after Cleveland. After that blast, Youlus formed new then movinto gas relation so similar to cleavage. And during, uh, gas elation, you're going to have a lot more cell division, a lot more growth. But in addition to that, you're also going to start differentiation. So that means that instead of being in a ball for him like that blast Ula we're actually going to have three distinctive layers of the embryo. And that structure is called a Castro last. Okay, so that is to find us three, uh, embryonic, um, for three. And Rio, I should say when the last step is organized. Genesis. So what this means is, um, at this point, this is when your organs begin forming on and you see even more differentiation, you see certain cells taking on certain rules within the body on. And that's when we really started to get specialized cells within the embryo. So now that we've looked and we talked about embryonic development, we can kind of go back to our answers and trying to see if any off the choices that we have make sense of what we just talked about so immediately. We should be able to eliminate a couple of these options here. Um, the 1st 1 that I see that I want to eliminate is, um something that doesn't actually have to dio with, ah, embryonic development or, um, really the fertilization or anything that we've talked about so far, when that's the secondary oocyte. So the secondary oocyte is referring to the mature excel within the female reproductive system. So we didn't talk about that at all today, so we can very, very clearly cross that out. That is not one of our viable options. The next thing that I want across out is Zygo, right, Because again, we talked about those. I go being the deployed cell of a sperms on egg cell forming together. This happens before embryonic development. This happens during fertilization. So again, not related here, we can cross that out. Goodbye. So now we're left with blast illa three embryonic layers and blast issue. Now, these are all related to embryonic development. So we have to think a little harder here. However, if we remember what we were just talking about, um, we did very clearly defined blast ula as being a, um righted again as being a fluid filled follows owns. Great. So and this happens at the end of the day, so nah. Cracked gas relation so we can get rid of this because we know this is not what we're looking for. Now, if you notice blast, Ula sounds similar and look similar to blast a seal. And while it's not always the case that because something sounds similar, it means something similar. It is something that, uh, can be helpful to be aware of. And in this case Ah, the blast, Cecile. I was actually referring Teoh with fluid within the blast. So again, this is related to cleavage, not gas relation, So we can cross this out as an option as well. So what we're left with is three embryonic layers and we obviously we don't want toe. Just guess we don't want to just be happy with what we were able to cross off every other option. We want to definitively know that this is the right choice. Um, and if you go back to what we were just talking about again when we're talking about great gas relation, we mentioned something called gastro. Well on the Gasparilla is the end stage of gas relation when ah, the cells have formed a three layered embryo on. And this is why our answer here is three embryonic players, because the definition of Gasela is a three is a three layered embryo. That's what our answer choices here. So we can definitively say with certainty that our answer is three embryonic layers of that made sense. I hope you guys have a better understanding of embryonic development and then hopefully see you guys soon.

It. We're going to be labeling these stages in human developments by the order they happening. So which of these comes first? Well, the first stage is right after fertilization, and we have as I get. So there's I goes. First, give it a one off his Nuggets. We have the early cleavage, and this gives us the next state. What feels B plus assists. So that's two now. Glass assists continues. Its journey ends about seven days after fertilization. We get to implantation, so this is three. And now, after implantation, we get guest relations. This is full, so we now have a gas trailer and been relatively thes are quite late in developments. 1st 4 have been very early stages up. When that we have a neural tube, it's a that's helping most Inhumans on there to forming, so even your old to performs next at five. So now we have a very basic Embraer still with detail, and finally the tail disappears. So or 21653 is for solutions of this

In this question, we have the events of human development and we need to put them in the correct order. So what is the first step of development? Well, that's going to be when the gametes meet and we get fertilization and that gives us the zygote. So step one, the zygote forms. What happens after this? Well after this, we get leverage and that means we get rapid, it's a vision without an increase in size of Andrew and that gives us the blastocyst. So process schools. What happens then while the blasphemous will undergo gas relation? Yes, relation. And we will have a gas trailer. Now we have the gas driller. The next stage between the three remaining is that the neural tube develops, so neural tube forms, then we get the hobbies so heartbeat, and finally the tail disappears relatively late in development.