For this reason, Dionya was the place of aspiration for Greek doctors.

Davers broke open the skin of the model's jaw and neck, revealing the inner passages: "Look, the passages of the mouth and nose merge here, and then divide into two passages—"

He pointed to a hose made of nitrate leather: "We all know that the nose is used to breathe air, but the mouth is not only to breathe air, but also to eat and drink. Air and food go through their own channels, and after long-term observation by medical doctors, they think that this pipe goes through air, and call it trachea. And the other passage behind him, through food and water, we call it the esophagus. Everyone touches the lower part of their neck, and the harder bumps under the skin are not smooth, and the trachea is not smooth.

The Gentile doctor at the bottom of the pulpit literally touched his neck with his hand and felt what Davers called the trachea.

"One might ask if food and water can easily enter the trachea when the openings of the esophagus and trachea are connected?" Davers said, seeing many people nodding, so he smiled: "Actually, it's almost impossible. There is a very soft bone in the opening of the trachea, which automatically covers the opening of the trachea when we swallow, preventing food and water from entering the trachea. If you are interested, when the meeting is over, you can come and see how accurate this mannequin has been made by our Dionian craftsmen under the guidance of doctors. But don't break it, this model is the jewel of the medical school, and you can't buy it for any amount of money! I'm right, Herps. ”

"Yes, Mr. Davers. Usually we only use it when we are teaching, and we usually don't let people touch it. Phelps laughed.

When Davers and Herps said this, the Gentile doctors were so itchy that they stood up and looked at the mannequin beside Davers, and the scene was a little chaotic.

Davers continued, "I've heard that the young Dr. Critos of the medical school of this cartilage. For this reason, he also specially dissected live pigs and sheep, and carefully observed the movement and mechanism of this cartilage, right? ”

"Yes." Phelps nodded.

"Is he here today?" Davers asked, smiling.

"Here we are."

"Well, then, ask Dr. Critos to stand up and let everyone know each other." Davers laughed and said loudly.

Critos stood up shyly under the push of his colleagues.

"Let's thank Criteos with a round of applause for this important appearance!" Davers was the first to applaud, and then the audience burst into applause, and his classmates even whistled excitedly

Critaus was nervous and excited.

Lycasus looked enviously at Critos, who was standing in front of him: this doctor, who did not look much different from himself, was shyly accepting the applause of the audience, when would he be able to make a name for himself in Greece like him, instead of being an apprentice like a slave every day?

"Critos, I look forward to you having more progress in medicine and making greater achievements!" Davos encouraged him enthusiastically.

It may seem ridiculous for a young man to encourage another young man in the tone of an elder, but most of the doctors present don't think so. And Critaus was even more excited, and his chest rose and fell sharply: "Okay...... Okay, Mr. Davers! ”

After Critaus sat down, Davers continued: "If you don't eat seriously and you suddenly choke, it's actually because the cartilage doesn't cover the trachea in time, causing food to enter the trachea; If a mother comes to you with her baby in her arms and tells you, 'Your baby chokes on milk,' that's probably the reason for that......"

Davers's words were taken to heart by the Gentile doctors, confirming the similar cases he had seen before.

"The air travels down the trachea to an organ that the Dionian Medical School has dissected many times and called it the lung." Davers said, breaking open the mannequin's chest and disassembling the left lung carved out of wood and showing it to the public.

"As a result, the medical school revealed that there is a lung on the left and right sides of our body, which is like a pig urine bubble for children to play with. When air enters when you inhale, the lungs expand; When you exhale, the air is expelled and the lungs shrink. It may be strange to you that air enters the lungs from the mouth and nose, and then exhales through the lungs, and then turns around and returns to the original point, which seems to make no sense. But I tell you, our bodies are the most precious treasures that the gods have given to the world, and they are so wonderful that they never do anything meaningless! ”

Davers looked around at the doctors in the audience, saw that they were all listening attentively, and said seriously: "After many autopsies in the medical school, after the trachea enters the lungs, it continues to branch out thinner pipes downward, just like the branches of a big tree branching out, and finally how big can we see the trachea?" ”

Davers plucked a head from his head and said, "It's so big!" And what is the end of such a small trachea? Can anyone tell me?! ”

At this time, a young doctor from Ionia stood up: "It's blood vessels!" At the time of our dissection, we had many equally small blood vessels intertwined with these trachea, and these small blood vessels were formed by the continuous differentiation of two large blood vessels from the heart......"

"So, what's the use of these two large blood vessels from the heart?" Davers continued.

"They come from different parts of the heart, one is responsible for pumping blood into the lungs, and the other is responsible for collecting blood back from the lungs."

"What's the obvious difference?"

"Hmm...... It was one blood vessel that pumped out, and two blood vessels that came back......" The young doctor replied hesitantly.

"Is there a difference, is there?"

"Uh......" The young doctor blushed and couldn't answer.

"Thank you for your answer, what's your name?"

"Strobus of the Dionian Medical School."

"Thank you for your wonderful answer, you said it very well!"

Strobus, who was originally slightly depressed, smiled again when he heard Davers's compliment.

"Ladies and gentlemen, the air goes round and round in the lungs and goes out, and the blood turns around in the lungs and goes back to the heart, and if nothing is born, then our bodies are too boring to do such meaningless things all the time, is this possible?!" While Davers asked a question, causing everyone to ponder, he replied categorically: "Of course it can't be!" The air and blood must have produced some kind of wonderful reaction in the lungs, but we can't see it with our naked eyes, just as we can't see what makes our wounds infected. So what is this reaction? How important is it to our body? ”

When the doctors heard this, they showed great interest, and while they were thinking, they pricked up their ears to listen to Davers's next speech.

Davers smiled, "I don't know what reaction is caused by blood and air, but we can show the existence of this reaction through certain phenomena. Herps, have you ever looked closely at the blood in a human or animal body? What is the difference between your visible blood? ”

"Blood?" Phelps pondered. To be honest, Davers didn't tell him in advance about the topic of his speech today, and he, like everyone else, was used to transparent air and didn't think deeply about it. In addition, in the past two years, he has become the head of the Ministry of Health, and he is also the director of the Turiyi Hospital and the director of the Dionian Medical College, and the administrative work has increased, and there is no time for medical research.

Stacy Kodas next to him was also lost in thought.

"Oh!" Someone suddenly remembered something and shouted: "It's the color!" The color of blood! ”

Davers looked intently at the person who spoke to Critos, and he looked appreciatively at the thoughtful and creative young doctor, and then quickly withdrew his gaze: "That's right, it's the color of blood!" Medical school doctors, if you have done a vivisection of an animal on this, you will see that the blood that was originally dull color enters the lungs and is brought back to the heart by another blood vessel, and the blood has become a bright color. There is only air and blood flowing in the lungs, so there must be something in the air that has entered the blood, and the color of the blood has changed! And this kind of thing...... What role does this invisible object play in entering the bloodstream? ”

Phelps, Stascikodas, Critos...... All the doctors, including Lycassus, were staring at Davers at the moment, all holding their breath lest they miss a word.

Davers's expression also became serious: "We noticed that the blood that returned to the heart was pumped by the heart to all parts of the body, and the bright red blood was reflected in our body. Our lips are red, our fingers are red, and our faces become red with movement...... But when we see a person with these characteristics, we can easily judge that the person is healthy and energetic based on our years of medical experience. And we sometimes encounter patients who have purple lips, black ends of their hands and feet, blue faces, and walk tremblingly...... It will also be easy for us to tell that the person is sick, and very sick. Isn't this the change that these two kinds of blood show in their bodies when they are mixed in and out of this air thing?! Can we think that this kind of thing is as indispensable to the human body as food, it makes us healthy and energetic?! Can we also infer that one of the trachea, or lungs, or the blood vessels that enter the lungs, or back to the heart, is faulty in one of the ways in which the air does not reach the whole body through the blood? ……”

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