"Does it hurt?" Mei Zi asked A Jing anxiously. Although she was eager to try before she did it, it was her turn now. When she asked her to take this blue blood-collection needle to stab someone else's finger, she was afraid that it would hurt her.

"It doesn't hurt." Seeing that Mei Zi couldn't do it again and again, A Jing gestured on his fingers several times with the tip of the needle. Although it didn't pierce the skin, it felt quite painful.

So he took a blood-collection needle and broke the plastic round pullover on it as demonstrated just now, revealing the tip of the needle hidden inside, and then gently pricked it on his left ring finger.

The needle of the blood collection needle was very sharp. With just one pierced, the bright red blood beads emerged from the fingers. It was a fool to say that it didn't hurt. After all, the ten fingers were connected to the heart, but it was not as painful as imagined. He had just experienced the irritating pain of alcohol disinfection, so these minor injuries and pains were naturally no problem.

Although the small blood bead came out, it did not drip onto the glass sheet just because A Jing squeezed it hard there. It was still hanging high on his fingers. A Jing was helpless and had to ask Huangshi, "Chief, do I need to stab the hole bigger?"

Huang Shi didn't expect this situation, but he recalled the blood flow he had at the blood station before, and then he remembered that it seemed that the doctor came up with the glass sheet directly, "No, no, just just take your fingers and wipe it on the glass sheet."

"Plum, give me a cotton swab." After A Jing left two drops of blood on the glass sheet, he saw that Plum was still a little stunned, so he quickly reminded him.

Meizi then realized, "Oh, oh, here, here." She quickly took a cotton swab from the box and handed it to him.

After A Jing took the cotton swab, he clamped it with his big finger and ring finger. Then, according to the format Huang Shi just mentioned, he wrote his name, age, and other information on it, and waited for Miss Hong'er's reagent to drip and test results in the empty space.

Because Hong'er only does the job of absorbing and dripping reagents, the steps are simple, naturally and quickly, but you should also be careful not to mess with the reagents, so she muttered something in her mind, that the one on the left should drip A and the one on the right should drip B.

Seeing that Miss Hong'er had already dripped the reagent, A Jing also filled in the reagent content on both sides. After writing, he handed it to Huang Shi, "Chief, is that okay?"

"It's OK, but we missed one more thing."

"What's the matter with the leader?" A Jing felt that it was very perfect. That's what he did just now.

"Give me the pen." After saying that, Huang Shi took the pen from A Jing, thinking that it was a fountain pen, but if it was a ballpoint pen, he had to find another way.

After A Jing saw the leader take the pen, he made a five-pointed star mark at one end of the glass sheet, and then returned the pen to himself. After thinking for a while, he understood and laughed.

"Do you understand?"

"Yes, Chief, I understand."

Hong'er and Meizi looked at Huangshi and Ajing as if they were slutty. They said something that made people confused and were confused, but they were embarrassed to ask.

"Okay, it's not bad, but I have to add another manpower." Huangshi found that in addition to the omissions in the operation process, there was also a shortage of manpower, because one person disinfected, collected blood, stopped bleeding, and one person was responsible for dropping reagents, and then another person recorded the inspection results. This was simply perfect, and it was completely comparable to the "assembly line division" of other time travelers.

If only a few people have blood type tests, or the time requirements are not so urgent, then of course you can check one or the other and sit quietly and wait for the results to come out. However, there are still more than fifty people waiting for the next one, so you really can't do this.

To speed up, we have to wait for the results to come out in a "division of labor in the assembly line". This is actually the reason why Huang Shi arranged Yu Guangtao and the others to move the table in front, but he forgot to arrange another person to run a separate order.

Huang Shi looked into the crowd and waved to the person sitting in the middle of the first row below, "Come here."

"Hello, Chief, did you call me just now?" The man hurried to Huangshi. It turned out to be a thin young man.

"Yes, what's your name?" Huang Shi saw that although his face was a little bit strange, he said a mandarin with a Shandong accent. He was surprised and kind, so he asked a special question.

"Chief, my name is Zhou Damu." Zhou Damu did not expect that the leader would ask his name in Mandarin, and was overjoyed. This was the first time he had heard a northern accent in this Fujian area in the past year.

"Okay, Damu, I've recorded it." Huang Shi remembered why he felt like a slutty when he heard his name. Because Chen Youxin reported his name at the beginning, his name was on the list of friends, but he should have been unkempt that day, and he didn't know where to stay later, so he didn't notice him.

"Chief, what are your instructions?"

Hearing the tone of the guy who often appears in this sketch, Huang Shi smiled, "Haha, Damu, please help me take this piece of glass and paper to the table, press the paper under the piece of glass. There is blood on the piece of glass. You must put it flat and not let it tilt, do you know?"

...

"Chief, let's test my blood below." After seeing that Zhou Damu had taken away the paper and glass sheets, Hong'er pulled out another piece of glass from the box and said to Huang Shi.

Huang Shi waved his hand, "You and Meizi don't need it, just let the adults come up and test it one by one."

He thought to himself that there were more than fifty people sitting below, first removing the elderly and children, and then removing young people as sick as Zhou Damu. There were at least thirty young and middle-aged people, and according to the probability, there would definitely be seven or eight types of blood.

"Okay, Chief."

So, after Hong'er's greeting, starting from Yu Guangtao, the people sitting below were called up one by one. Because they had changed their partner, Mei Zi did not have the "sweetness and mercy" she just now. After she waited for others to sit down, she asked everyone to stretch out her left hand, and then used an alcohol-containing cotton swab to disinfect their fingers, and then took the blood collection needle and stabbed it hard.

"Chief, why do you have to tick your ring finger?" Seeing those people being thorned by plums, they could be said to be full of black threads. They thought that it was fortunate that her finger was not tickled by her. If it was so scary, but I remembered the leader's special explanation just now, and could only use the ring finger of his left hand to collect blood, so I asked.

Why can only use the ring finger to collect blood? Huang Shi had never thought about this problem before, but because every time he went to the hospital or the blood donation station, the doctor asked him to stretch his ring finger out. However, now when A Jing asked, he thought about it carefully and found that the reason for stretching his left hand was actually very simple, it was just the following two points.

First of all, it is convenient and safe in operation, because the hands are the most flexible and free-moving organ among the exposed parts of the human body in daily life. It can stretch and shrink, and can actively cooperate with the doctor, making it very convenient for the doctor to operate.

In addition, there are very rich capillary networks on the fingertips of the hand, but there are no larger arteries and veins. This can not only meet the needs of blood collection, but also avoid a large amount of bleeding and stop bleeding.

Secondly, blood collection is collected with the left hand, which has few functions. Although blood collection is a slight human trauma and is considered a sterile operation, it still takes several days for the small wound to be completely repaired.

Because most people use their right hand to work and live, and fine movements are generally completed with their right hand, and the left hand has more free time. Therefore, blood collection and selection of the left hand will have less functions that affect the use of the hand.

The above is the reason why Huangshi could think of blood collection with his left hand. As for why it was the ring finger, he guessed that it may be related to the frequency of use. In fact, in addition to the three reasons he thought of, the doctors chose the blood test site after the ring finger was traumatized, which is related to the small sequelae and the pain feeling.

Because the human body's hands are large, in terms of anatomical physiology, the flexor tendon of each finger is wrapped with a synovial fluid sac, which plays a physiological role in lubrication, shock resistance and friction reduction. The size, depth and circulation of the synovial fluid sac of each finger are different.

The synovial sacs of the index finger and ring finger are relatively independent and do not communicate with each other. Moreover, the synovial sacs of the ring finger are located in the shallow part of the palm, so after trauma, even if it is infected, it will generally not cause deep lesions in the palm and will not implicate other fingers.

Moreover, because the fingers are rich in nerve endings, they are one of the most sensitive parts of the human body. However, the innervation of each finger is different, and the corresponding pain threshold is inconsistent. The inner side of the ring finger is innervated by the ulnar nerve, and the outer side is innervated by the median nerve.

If blood is pricked in the middle of the fingertip of the ring finger, the ends of the ulnar nerve and the median nerve will be stimulated at the same time, causing stronger pain; if blood is pricked in the inner side of the fingertip of the ring finger, it will only affect the ends of the ulnar nerve, so the sensing range is the least and the pain is relatively mild.

The seemingly simple problem is quite complicated in theory, and Huang Shi didn't know the deeper reason. He could only draw a picture of the cat and tiger, and told the three of them that he would prick the ring finger of his left hand to collect blood. As for which part of the prick, he did not mention it.
Chapter completed!