Beast Studio

Academician Liu's class is naturally sitting without absence.

Students who can study for a Ph.D. in the Institute of Zoology, Chinese Academy of Sciences have a desire for knowledge that is beyond ordinary people.

I wish Academician Liu to inculcate all the knowledge in his brain to them, even if he could not digest it immediately, he would be able to hear it.

Liu Wei wears like an ordinary student.

It is a little younger.

However, after a long time of survival and experience in the wild, his original handsome face was smeared with the taste of a mature man.

So it seems that it is not different from the doctoral students present in the large classroom.

He took a seat in the back row and sat down.

Academician Liu took his mug to the classroom, took two sips, and put it on the lecture table.

The assistant started to debug the mobile teaching equipment.

After the commissioning was completed, the assistant nodded to Academician Liu and sat in the first row near the door.

The classroom remains very quiet.

It is completely different from the classroom of elementary and junior high school students. Even if the class has not started, there are some problems between the classmates and the voice is lowered. They are afraid to affect other classmates. After all, who can sit in this classroom, who is better than anyone , Not much difference!

Liu Wei suddenly felt out of place.

Academician Liu walked onto the stage, his right hand fell on the lid of the thermos, hummed, and ran his throat.

The classroom suddenly entered an atmosphere of seeking knowledge.

Everyone's eyes were on the podium.

Academician Liu smiled, "Students, the topic we are discussing today is the excitement of biology. This topic is an old-fashioned animal physiology topic, and it is also the most basic feature. Before starting the formal class, I will put some videos for the students! "

Academician Liu stared at the computer on the podium and clicked to play.

The projector projects the video image on the wall next to it.

The video being played was edited from the video recorded by Liu Wei.

I have to say that Academician Liu’s assistant is a very good editing expert, closely grasping the theme of “excitement”, and making excitable video clips of beasts in panic, wrestling, mating, etc. to make a collection.

Liu Wei sees the blood boiling himself.

Compared with other students in the classroom, their thinking is more biased towards the reaction of the animals behind the **** video.

However, even the most rational person has to pay attention to another hero in the video while watching the video, that is Liu Wei.

The girl sitting next to Liu Wei, wearing retro round-frame eyes, she pushed the glasses frame on the bridge of her nose, watched the video, and then looked at Liu Wei.

Seems to be the same person!

She reached out and patted Liu Wei's arm. Liu Wei looked back at her, and she asked, "Classmate, is the person in the video you?"

Liu Wei nodded, "Is there any problem?"

"No, no!" she waved.

Then the students at the front, back, left, and right looked at Liu Wei and at the unremarkable corners of the back row.

As more and more people look back.

This originally quiet classroom gradually became noisy.

Someone recognized Liu Wei sitting in the back row, "It's really him! I've watched his live broadcast!"

"There is a buddy in our bedroom watching every day, I'm fascinated!"

"It is said that it seems to be a student of Academician Liu, a representative of the younger generation of animal research practice in China!"

Academician Liu stood on the right side of the classroom, leaning against the window, and looked at Liu Wei with the eyes of the students.

Liu Wei kept a smile on his face.

In fact, he actually hopes that it is live broadcast now, so he can preach a bit more casually: "Basics, basics!"

However, it is now in the classroom of doctoral students of the Institute of Zoology, Chinese Academy of Sciences.

The atmosphere is completely different.

At least no words such as "recessed trough..." appear in the classroom.

A total of 15 minutes of video.

After the release.

Academician Liu went to the podium to close the video and smiled: "When watching the video, the eyes of the classmates are all looking back, you should find out, the person who is in the video with the wild is my student Liu Wei, now Just sit in the right corner.

Before coming to class today, I decided to discuss the topics in the class. The content of biological excitement is very wide and deep.

Broadly understood, when the body is stimulated by changes in the surrounding environment, it has the ability to react, and we call it excitability.

Environmental changes that can cause the body or its tissue cells to react are called stimuli. Stimulation causes changes in the metabolism of the body or its tissue cells and changes in its activities, called reactions.

There are two types of reaction: one is from relatively static to active state, or activity from weak to strong, called excitement.

The other is from activity to a relatively static state, or activity from strong to weak, called inhibition.

Whether the response caused by the stimulus is excited or suppressed depends on the quality and quantity of the stimulus and the functional state of the body at the time.

In the video just played in the video, the excitement of the beast is that a relatively static state becomes active, and then Liu Wei uses his own experience and professional knowledge to try to change the cognitive environment of the beast, and then changes the active state into a relatively static state. , Which belongs to inhibition.

We can see that the quality and quantity of stimulation are balanced before and after the contact, and the body, that is, the beast in the video, switches between the two states.

The general principle of operation is this. Before entering the in-depth discussion, I would like to ask Liu Wei to come up and share his understanding of biological excitement!"

Academician Liu took the initiative to clap two hands.

The students clapped their hands.

Liu Wei eased his breath, looked for the state of the live broadcast, raised his spirit, and thought about it in reverse. In fact, he was not so nervous.

He took the stage and smiled: "Hello, brothers and sisters, I am honored to attend Teacher Liu's discussion class today.

Relatively speaking, my academic research direction is different from yours, and it is biased towards biology into chemistry, and your academic research is biased towards applied science. "

Looking back at the topic on the screen, he preached: "Mr. Liu just interpreted excitability in a broad sense. I now take you to understand it in a narrow sense. Excitability refers to the ability of excitable tissues or cells to undergo an excitatory response when stimulated or characteristic.

Excitable tissue refers to the tissue (or cell) that can generate action potential after being stimulated is called excitable tissue (or cell), usually refers to nerve, muscle and gland cells.

In fact, almost all living tissues or cells have a certain degree of ability to respond to external stimuli, but the sensitivity and the form of the response are different.

In various animal tissues, in general nerve cells, muscle cells and glandular cells show high excitability. In the video just now, the aggression faced by me is mainly the excitability of muscle cells. Usually We call this the instinctive response of animals.

The mating behavior of elephants in the video is the excitement shown by glandular cells.

In addition, cardiomyocytes are as excitatory as nerve cells, and are similar to the periodic changes in excitability of nerve cells.

When myocardial cells are stimulated to produce an excitement, the excitability will also undergo a series of periodic changes, which are closely related to the changes in membrane potential and channel functional status.

..."

Liu Wei couldn't stop at all.