Escape the Library

【Cell Factory-03】

After the cell mass is successfully implanted in the uterus and a blastocyst is formed, it will then undergo "delayering" 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", a mechanical sound of the system sounded in everyone's ears: "During embryonic differentiation, ectoderm, mesoderm and endoderm have been formed, and the cells of the three germ layers will be differentiated and developed later. China is not interchangeable, please divide labor in advance."

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

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

Yue Xingwen said, "It is up to Brother Liu and Senior Brother Xu to decide how to divide it." With the presence of the Academy of Biological Sciences and the School of Medicine, Yue Xingwen didn't want to direct this class. He, a liberal arts student, really doesn't understand embryo development. .

Xu Yishen gave everyone a serious introduction to science: "The ectoderm will eventually form the surface, the senses, the gods, and the glands, that is, the human epidermis, such as skin, nails, and hair; sensory systems, such as eyes, ears, and nose; nervous tissue, such as the brain and spinal cord. , nerves; there are also some sweat glands, sebaceous glands, salivary glands, etc. The cells in the ectoderm are generally smaller in size and divide the fastest."

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

Xu Yi paused for a while, then laughed and teased, "Would anyone like to go to the ectoderm? Responsible for making our baby's eyes, nose, and hair?"

Lan Yarong took the initiative and said, "I'm Yan Control. We want to have a beautiful baby with fair skin, black hair, and big eyes. I'll go to the ectoderm and take charge of our baby's skin."

Senior Sister Lan said that she wanted a good-looking baby, which was quickly approved 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 take care of the sweat glands with you."

Qin Lu originally wanted to go to ectoderm, but she and her sister looked exactly the same. If the two went to the same area together, they would not be able to tell them apart. She had to stay quietly behind Ke Shaobin, thinking about choosing later. Xu Yishen asked, "Is there a classmate left in the ectoderm?"

The next moment, Liu Zhaoqing said cheerfully: "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 born will become paralyzed."

Everyone: "..."

Sounds stressful.

Although there are 12 of them, there are too many details that need to be paid attention to in embryo differentiation, which is really sloppy.

The nervous system is indeed very complex, and you have to find a professional person to handle it. 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 brain's instructions.

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

The four individuals of the ectoderm were quickly identified.

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

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

Zhuo Feng volunteered and said, "I'll go to the endoderm. I can take 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 do the baby's digestive system together?"

Xin Yan said lightly: "And then train the baby to become a foodie?"

Everyone: "..."

Xin Yan's words are always so sharp!

Ke Shaobin rolled his eyes and smiled: "Only with a good digestive function can the baby absorb nutrients and grow up quickly! Don't forget, our mission is not only to give birth to the baby smoothly, but also to accompany him to grow up and go to kindergarten. If a child is anorexia, or has poor digestion and absorption, it will be very troublesome."

Liu Zhaoqing couldn't help complaining: "How can Xiao Ke's tone be the same as that of an old father who is looking forward to the birth of his child?"

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

Everyone: "..."

Ke Shaobin is really getting weirder as he talks, as if he is pregnant!

Yue Xingwen held back a smile and said, "Then you can go to the endoderm and get rid of the digestive system. I believe that with Ke Shaobin taking care of himself, our children will definitely have a 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 listened to him, a computer major, skillfully reciting the digestive tract, and their eyes widened in surprise - what is a "hard-core foodie"? In order to eat, to study the human digestive system? Really have to accept.

Yue Xingwen wanted to give him a thumbs up, but found that he had turned into a ball and had no thumb, so he had to wink at Ke Shaobin.

Xin Yan's voice was still cold: "Then I'll go to the endoderm and be responsible for the liver and pancreas."

Qin Lu followed closely: "I also go to the endoderm. My high school is in the liberal arts, and I don't know much about embryonic development. Can I be responsible for the two structures of the thymus and thyroid gland? I will ask Xu if I don't understand. Senior Brother and Senior Brother Liu."

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

Both the ectoderm and the endoderm are human, and only the last mesoderm remains.

Yue Xingwen asked, "What about the mesoderm?"

Xu Yishen said: "Except for the inside and outside, the rest is the responsibility of the mesoderm. In the process of embryonic development, the differentiation of the mesoderm is the most complex, the dermis, muscles, bones, connective tissues, and the blood circulatory system, including the heart, Blood vessels, bone marrow, lymphatic vessels of lymph nodes; the ends of the various ducts of the body cavity, the serosa of all internal organs, the connective tissue, blood vessels, smooth muscles in the internal organs, the kidneys of the urinary system, the ureters; and the reproductive tracts…”

Yue Xingwen felt a big head just listening to it: "Is there so much?"

Xu Yishen's voice revealed a hint of helplessness: "Yes, the mesoderm has the most types of cells. The remaining four people will have relatively heavy tasks, Xingwen, Pingce, 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 am responsible for all the muscles in the body. The more complex cardiovascular system is left to Senior Brother Xu."

Xu Yishen asked: "And the dermis and visceral serosa, can I leave it to Xiaonian?"

Yue Xingwen thought about it and said, "How about Qin Lu and Xiao Nian change? Xiao Nian is easy to get lost, and it would be better to be responsible for the thymus, thyroid, and other separate organs, making him run around all over the body, he May be confused."

When Zhang Xiaonian heard Senior Brother Xu talk about the structure of the mesoderm just now, he wanted to find someone to change it, but Senior Brother Xingwen took the initiative to help him out. In the process of embryo differentiation, no one can make mistakes. Everyone is thinking about the baby. Anyone who makes mistakes may cause fetal malformations. He also thinks that he is responsible for the organs will be more secure.

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

Qin Lu readily agreed: "Okay, then I'll come to the mesoderm, and I'll be responsible for the thymus and thyroid gland in my childhood."

Everyone is finally divided.

Xu Yishen said: "Okay, let's get to work. For the ectoderm, go to the outermost channel, for the endoderm, go in, and the mesoderm stays in place."

When everyone heard the order, they rolled towards their own location.

Everyone took the **** they split, and after rolling for a while, they stood in a three-layer structure of outer, middle, and inner in order, and they were arranged in an orderly manner.

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

A brain-shaped light spot appeared in the ectoderm, and Liu Zhaoqing, who was in charge of the nervous system, quickly rushed over and started to divide. The originally spherical Liu Zhaoqing, because it differentiated into nerve cells, has obviously changed in body shape.

Lan Yarong, who was near him, rolled her eyes and couldn't help but said, "How did you become like a tree? And you have roots?"

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

Lan Yarong blinked: "Oh, so strange."

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

Xu Yi said with a deep smile, "Don't be surprised, because cells in different tissues grow differently. We will slowly change from spherical to various strange shapes in a while."

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

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

Lan Yarong was stunned for a while: "Will I change into various shapes later?"

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

Lan Yarong: "..."

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

Everyone can't imagine such a picture.

Liu Zhaoqing was busy dividing nerve cells by himself, and everyone else was on standby.

Soon, a mechanical voice sounded in my ears: "At 6 weeks of pregnancy, the primordium of the heart appeared and began to beat."

As soon as the words fell, everyone saw that the two tube-shaped structures on the mesoderm side suddenly merged. Xu Yishen hurriedly rolled over, took the place of his heart, and began to deform and split quickly.

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

Xu Yishen was busy for a moment, and suddenly, a heartbeat of "bang" and "bang" sounded in the entire space.

This kind of heartbeat from the fetus made everyone feel very magical. Everyone calmed down in tacit understanding and listened carefully to the heartbeat from a new life.

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

After an unknown amount of time, Xu Yishen said with a smile, "It's strange, why do I have a sense of anticipation to be a father?"

Everyone: "..."

When they go back to school later, can they tell people—

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