Escape From the Library

【Cell Factory-03】

After the cell mass implants successfully in the uterus and forms a blastocyst, it will go through a "delamination" method and finally differentiate into an embryo composed of ectoderm, mesoderm and endoderm, and the embryo will slowly differentiate into a complete human body structure.

Almost as soon as Xu Yishen raised the question of "germ layer", the system mechanical voice sounded in everyone's ears: "During the differentiation of the embryo, the ectoderm, mesoderm and endoderm have been formed. are not interchangeable, please divide the work in advance."

Everyone stood in several rows at first, but at the next moment, two clear dividing lines appeared between them, dividing their "cell group" into three layers: outer, middle, and inner.

Liu Zhaoqing suggested: "There are twelve of us, is it better to be in a group of four? Ectoderm team, mesoderm team, endoderm team?"

Yue Xingwen said: "Brother Liu and Senior Brother Xu will decide how to divide it." With the presence of the School of Biological Sciences and the School of Medicine, Yue Xingwen didn't want to direct this class. As a liberal arts student, he really doesn't understand embryonic development. .

Xu Yishen seriously explained to everyone: "The ectoderm will eventually form the epidermis, senses, nerves, and glands, that is, the human epidermis, such as skin, nails, and hair; sensory systems, such as eyes, ears, and nose; nervous tissues, such as the brain and spinal cord. , nerves; and some sweat glands, sebaceous glands, salivary glands, etc. The cells of the ectoderm are generally smaller in size and divide the fastest."

It is easy to understand the fast splitting speed, because human skin and hair have the fastest regeneration ability, and once the internal organs are damaged, it is difficult to recover.

Xu Yishen paused, and joked with a smile: "Who of you would like to go to the ectoderm? Responsible for making our baby's eyes, nose, and hair?"

Lan Yarong took the initiative to say: "I am Yankong. We want to have a beautiful baby with fair skin, black hair, and big eyes. I will go to the ectoderm and be in charge of our baby's skin."

Sister Lan said that she wanted a good-looking baby, and this point of view was quickly agreed by the girls.

Lin Manluo said: "I also go to the ectoderm, and I take care of the eyes, nose, eyebrows and other facial features."

Qin Miao said lightly, "I'll be with you, let's take care of the sweat glands."

Qin Lu originally wanted to go to the ectoderm, but she and her sister looked exactly the same, and if they went to the same area together, they would not be able to tell each other apart, so she had to stay quietly behind Ke Shaobin, thinking about choosing later.Xu Yishen asked: "Is there a classmate short of the ectoderm?"

In the next moment, Liu Zhaoqing said straightforwardly: "I also go to the ectoderm, which is in charge of the nervous system. The nerves are all over the body. If something goes wrong, the baby will be paralyzed."

Everyone: "..."

It sounds stressful.

Although there are 12 of them, there are too many details that need to be paid attention to in the differentiation of embryos, so it is impossible to be sloppy.

The nervous system is indeed very complicated, and it needs to be handled by a professional. From the brain, spinal cord, to the neural network all over the body, if any nerve goes wrong, the corresponding part will not be able to hear the instructions of the brain.

Liu Zhaoqing took the initiative to ask Ying to be in charge of the nervous system, and everyone was very relieved.

The four of the ectomorphs were quickly identified.

Xu Yishen continued: "The endoderm will eventually form the epithelium of the entire digestive tract, respiratory tract, and lungs, as well as the epithelium of the liver, pancreas, thymus, and thyroid gland. Simple memory is elimination, exhalation, liver, and pancreas."

The endoderm mainly forms the inner cavity of the human body, the two systems of digestion and respiration, in which there are a large number of pipe-like structures.

Zhuo Feng volunteered and said: "I'll go to the endoderm, I can be in charge of the respiratory system. I studied science in high school, and I still remember some biology."

The eyeballs behind Ke Shaobin's glasses moved left and right, as if he was thinking. After a few seconds, he said, "Xin Yan, do you want to go to the endoderm with me? Let's work on the baby's digestive system together?"

Xin Yan said indifferently: "Then raise the baby to be a foodie?"

Everyone: "..."

Xin Yan's words always hit the nail on the head like this!

Ke Shaobin rolled his eyes and smiled, "Only when the digestive function is good, the baby can absorb nutrients and grow up quickly! Don't forget, our task is not only to give birth to the baby smoothly, but also to accompany him to grow up and go to kindergarten. If children are anorexic, or have poor digestion and absorption, it will be very troublesome.”

Liu Zhaoqing couldn't help complaining: "How can Xiao Ke's tone sound like an old father who is looking forward to the birth of a child?"

Ke Shaobin said seriously: "Although I have been single for 21 years, it is an unforgettable experience to have a baby with everyone in the library. I will definitely cherish this hard-won opportunity."

Everyone: "..."

Ke Shaobin really got weirder the more he said it, as if he was pregnant!

Yue Xingwen suppressed a smile and said: "Then you go to the endoderm and work on the digestive system. I believe that with Ke Shaobin personally checking, our child will definitely have a particularly good appetite!"

Ke Shaobin smiled happily: "Of course. As a foodie, I know the structure of the entire digestive system, from the mouth to the esophagus, stomach, duodenum, empty field, cecum, ileum, appendix, colon, rectum... ..."

Everyone's eyes widened in surprise when they heard that he, a computer science student, had memorized the digestive tract proficiently—what is "hardcore foodie"?In order to eat, actually go to study the human digestive system?I really have to accept it.

Yue Xingwen wanted to give him a thumbs up, but found that he had turned into a ball without a thumb, so he had to wink at Ke Shaobin.

Xin Yan's voice was still cold: "Then I will go to the endoderm and be in charge of the liver and pancreas."

Qin Lu followed closely and said, "I'm also going to endoderm. I majored in liberal arts in high school, and I don't know much about embryonic development. Can I take care of the thymus and thyroid? If I don't understand, I'll ask Xu Brother and Brother Liu."

Xu Yishen said: "Don't worry, in general, Senior Brother Liu and I will help everyone check it out."

Both the ectoderm and endoderm are gone, leaving only the mesoderm.

Yue Xingwen asked, "What about the mesoderm?"

Xu Yishen said: "Except for the inside and outside, the mesoderm is responsible for the rest. During embryonic development, the differentiation of the mesoderm is the most complicated. The dermis, muscles, bones, connective tissue, and blood circulation system, including the heart, Blood vessels, bone marrow, lymph nodes, lymphatic vessels; ends of various ducts in the body cavity, serosa layer of all viscera, connective tissue, blood vessels, smooth muscle in the viscera, kidneys of the urinary system, ureters; and reproductive ducts..."

Yue Xingwenguang felt dizzy when he heard it: "Is there so many?"

Xu Yishen's voice showed a trace of helplessness: "Yes, the mesoderm has the most types of cells. The remaining four people will have a heavier task. Xingwen, Ping Ce, Xiaonian and me, the four of us are responsible for the mesoderm? "

Jiang Pingce said calmly: "No problem, I can take care of the bones of the whole body."

Yue Xingwen said: "I'm in charge of all the muscles in the whole body. I'll leave the more complicated cardiovascular system to Senior Brother Xu."

Xu Yishen asked: "There are also dermis and visceral serosa, can I leave it to Xiaonian?"

Yue Xingwen thought for a while, and said, "Why don't Qin Lu and Xiaonian switch? Xiaonian is easy to get lost, and it would be better to be responsible for separate organs such as the thymus and thyroid. Let him run around all over the body. It might be confusing."

When Zhang Xiaonian heard Senior Brother Xu mention the structure of the mesoderm just now, he wanted to find someone to replace it. Unexpectedly, Senior Brother Xingwen offered to help him out.In the process of embryonic differentiation, no one can make mistakes. Everyone is thinking about the baby. Anyone who makes mistakes may cause fetal malformation. He also feels that it is safer to be responsible for the organs.

Zhang Xiaonian took the initiative and said, "Senior Sister Qin Lu, are you willing to change?"

Qin Lu readily agreed: "Okay, then I'll be the mesoderm, and I'll be in charge of the thymus and thyroid in Xiaonian."

Everyone finally finished the division of labor.

Xu Yishen said: "Okay, let's start working. Those with ectoderm go to the outermost passage, those with endoderm go in, and those with mesoderm stay where they are."

When everyone heard the order, they rolled towards their positions one after another.

Everyone took the balls that they split, rolled for a while, and then stood in a three-layer structure of outer, middle, and inner in turn, and they were arranged in an orderly manner layer by layer.

The examiner's mechanical voice sounded again: "The nervous system begins to develop, forming the brain and nervous tissue of the fetus."

A brain-shaped light spot appeared on the ectoderm, and Liu Zhaoqing, who was in charge of the nervous system, quickly rushed over and began to continue to divide. Liu Zhaoqing, who was originally spherical, had also obviously changed in size due to differentiation into nerve cells.

Lan Yarong, who was near him, rolled his eyes and couldn't help but ask, "Why do you become like a tree? You still have roots?"

Liu Zhaoqing complained: "I am the dendrites and axons of nerve cells!"

Lan Yarong blinked: "Oh, that's weird."

Liu Zhaoqing: "..." He also felt a little strange.

Xu Yi said with a deep smile: "Don't be surprised, because the cells of different tissues grow differently, and we will slowly change from a round ball to a variety of weird shapes in a while."

Lan Yarong asked curiously, "What do skin cells look like?"

Xu Yishen said: "Skin cells will be more complicated, there are several layers, each layer is different, there are columnar, polygonal, fusiform, flat..."

Lan Yarong was stunned for a moment: "Then I'm going to change into various shapes later?"

Xu Yishen said with a smile: "In order for the baby to have fair skin naturally, you have to work hard to change a few more."

Lan Yarong: "..."

Sister Lan who looks like a pillar, Senior Sister Lan who is flat and flat, Senior Sister Lan who is polygonal?

No one can imagine such a scene.

Liu Zhaoqing was busy splitting nerve cells by himself, while the others stood by.

Soon, the mechanical voice sounded again: "At the 6th week of pregnancy, the heart primordium appeared and began to beat."

As soon as the words fell, everyone saw the two tube-like structures on the side of the mesoderm suddenly merging. Xu Yishen hurriedly rolled over to occupy the position of the heart, and began to deform himself and split rapidly.

With the emergence of numerous cardiomyocytes, the fetal heart forms.

Xu Yishen was busy for a while, and suddenly, heartbeats of "bang" and "bang" resounded throughout the space.

This kind of heartbeat from the fetus made everyone feel very miraculous. Everyone quieted down tacitly and listened carefully to the heartbeat from a new life.

Although the voice was weak, it was clearly transmitted to everyone's ears one by one.

After an unknown amount of time, Xu Yishen smiled and said, "It's so strange, why do I have such a sense of expectation to be a father?"

Everyone: "..."

When they go back to school in the future, can they tell people——

Although I have no experience in love, but I have experience in making children?