Why does it bleed when bitten by leeches?

In the daily learning process, everyone has memorized a lot of knowledge points. You must be very familiar with it! Knowledge points are the contents that others can understand after reading them or that I can master them through practice. So, what are the knowledge points? The following is what I arranged for you. Why does it bleed when bitten by leeches? For your reference, I hope to help friends in need.

There may be many children who have never seen or even heard of leeches. But don't underestimate it. It looks small, but it has a kind of "magic". Once bitten by it, it will immediately spit out blood. If something is not done quickly, the blood will keep flowing. The child is curious about why this happened. Today I will tell you the mystery.

Leech is an annelid, which looks a bit like earthworm, but its body is slightly flat and its length is different. The big one is 20 cm long and the small one is 1 cm. Leech's body can secrete a kind of mucus to make it smooth. They live in lakes, streams and ditches, or on aquatic plants and underwater. Sometimes I often climb to the wet grass or trees near the water.

They start their activities in late spring and early summer. In spring, leeches can often be found hiding in the mud of dry ponds. Leeches mainly feed on blood. The center of the bloodsucker's head is its mouth, and it has three fleshy jaws. There are many tiny serrations on the chin, which can cut people's skin and cause a Y-shaped wound.

The saliva it secretes when it bites people contains an anticoagulant, also called hirudin, which can make the blood of the wound not coagulate. So after a person is bitten by a leech, the wound will bleed. This is a wonderful way for leeches to be greedy. There are suction cups at the front and back ends of their bodies, which can be used to adsorb their bodies on human skin and continue to suck.

A full meal can be stopped for a long time. Leeches cling to people's skin when they bite, and it is difficult to pull them off. In this case, leeches can be soaked in salt water, which will be stimulated violently and fall down automatically. Squeeze some blood from the wound by hand to stop the bleeding.

Expand: leech component 1

Childhood is pure and unforgettable. In childhood, we may weave a beautiful story or have a quarrel. When we are alive, we find that those trivial things that are inconspicuous to our parents may be full of happiness, breed ideals and become the driving force for our pursuit. On the last day of Dragon Boat Festival, my father led a team to climb the ring road of Dongbai Mountain in Zhuji in the rain, but this climbing trip made me know about disgusting and interesting leeches for the first time.

Because of the rainy days for several days and the heavy rain in the early morning, the streams on the mountain are particularly abundant, running thousands of miles along the valley. There are small puddles everywhere along the way, and there are a lot of muddy water, even the weeds and branches on the roadside are dripping. When we reached the top of the mountain, we didn't walk a few steps. Our shoes and socks were all wet, and they were all covered with mud and rotten grass. It was uncomfortable to wrap our feet in wet socks. But also because of the rain, we saw several spectacular waterfalls, and really realized the artistic conception of "going straight down to thousands of feet", and also because of the rainy day, we saw the beautiful scenery filled with clouds.

Just as we were walking, enjoying the beautiful scenery and chatting, we met several senior donkey friends. They reminded us whether there were leeches on our feet. Let's find a dry place and check the soles and socks carefully. Wow, what? What about leeches? I was taken aback and muttered to myself. Then my brother and I kept asking my parents, what is a leech? It turns out that the scientific name of leech is leech, which likes wet and turbid water, likes blood and is poisonous. The sucker in the mouth is very strong, so it is not so easy to be caught when it is sucked on people's legs. So I want to see not only if my foot is a leech, but also what it looks like. Dad said, "Don't make a fuss. When we were young, there were more than a dozen leeches on our legs in rural rice fields. It's okay. " Well, I don't believe it. Not afraid of being bitten by leeches? I just don't believe it.

Finally, when there was a slightly dry rock on the hillside, we all sat down and began to check our legs and feet. Now, dad really found some small leeches on his brother's shoes, and then took off his brother's shoes and socks. Fortunately, there are no leeches on his legs. I didn't find any shoes on my mother and me. Finally, dad began to check himself. Tragedy happened. Two leeches sucked his leg. When dad rolled up his trouser legs, the leech's head really sucked the meat on his legs, and his small tail was tilted and dangling, as if sucking blood, enjoying human blood steamed bread and dancing happily! I look at this dark, earthworms-like monster, which is different from earthworms. All I can think about is fear, and I have goose bumps all over. I was so sick that I screamed. Dad didn't try so hard, smiled, grabbed the soft ghost leech on his leg with his fingers, twisted it a few times, and didn't unscrew it yet. Finally, he tore off the leech and fell far away, and his leg began to bleed. Then I found some shoes on his shoes. Looking at my father's indifference, I gradually got better and returned to a naughty state. I said, "Dad, you are so popular, and the leeches are so familiar with you that they will rub you!" " . Of course, a handsome guy like me is naturally loved. Hey, what a narcissistic dad!

Next, leeches accompany us on all our trips. Every once in a while, we should check whether there are leeches on our legs, because dad said that if leeches are not removed in time, they may enter blood vessels and break them after a long time, which may cause serious diseases. We kept checking and entertaining ourselves with leeches. Occasionally, my younger brother suddenly shouts "Sister, there are grasshoppers on your legs", which makes me look around with my feet in my arms. After careful examination, my brother smiled from ear to ear. It turned out that the demo was fooling me. At this moment, my mother said, "Hey, Yang Yang, what's that on your leg? It looks like an earthworm! " "Dad, let me see. It must be a leech! " My brother was nervous, too, and my mother couldn't help laughing. He realized that he had been cheated, and then we all laughed together!

In this way, we struggled with leeches all the way from Taibai Peak to the foot of the mountain, which took almost four hours. On a slate, we examined it carefully. My brother also found a leech sucking blood on his leg. After pulling it off, there was a purple circle on the small fresh meat on his leg. My mother and I didn't find any leeches on our legs. This is really providence. Dad found some shoes on the soles. After cleaning, we got on the bus and went home. But after driving for a while, dad said that his left leg was a little itchy and painful, and rolled up his trouser legs. Wow, a leech really sucked blood on his leg! Oh, my god, have you checked it all carefully, or is there? So whenever I feel itchy, I wonder, is there a leech biting me?

When I got home, I found that my father's leg was still oozing blood. It turns out that the saliva secreted by leech sucker contains anticoagulant toxin, which can prevent blood coagulation. Dad had to put on a band-aid.

Oh, the beautiful Dongbai Mountain, oh, the spectacular waterfall, oh, the leech that makes me uneasy! This is really an unforgettable journey!

Component II of leech

Away from home, I haven't seen leeches for decades. Although it is disgusting and unpopular, in my heart, just like the first lover in my life, the trauma in my heart will never be erased.

What is a leech? Maybe many people haven't seen it. It is a unique small animal that feeds on blood. In this regard, no matter what kind of animals in the world, no matter how tall and fierce, as long as they are found, they will try their best to take a bite and suck your blood. Although it is small, soft and smooth, and its appearance is not surprising, it is still called the king of kings in the animal kingdom.

People have great awe of leeches because I experienced them personally when I was young. I remember when I was seven years old, I just entered the first grade of primary school. After school in the afternoon, it was hot, and I took a bath with five or six classmates in Tangmengtang, not far from school. In the hot summer, it is the season for leeches to breed. When I was having a good time, a leech secretly bit my shade and quietly sucked my blood, which was neither painful nor itchy. I didn't find it in time. After everyone took a shower and went ashore, I felt something soft and heavy across my shade, jumping and crying with fear. At this time, no adults or children were around, and I didn't know what this round, soft, nose-less, aimless thing was. They all ran away in fear. At the moment, I am the only one left at the fish pond intersection, which is even more frightening. I cried my head off and danced hard for about ten minutes. That round and soft strange thing finally fell from my lower body to the ground.

Before being bitten by a leech, when I was a child, I heard my father tell the story about leeches in Li Zi's Hunting and Bleeding, but I never really saw leeches. Dad said that one night, it was dark and I couldn't see my fingers. A Gigi Lai sat beside a big tree in Wuzhishan, drinking and hunting. When he was drunk, a leech sneaked in, climbed up Li Zai's nakedness and bit the shade to suck blood. It was not until the leeches left after eating that Li Tsai's trousers were wet with blood from the wound, and he realized that it was his bleeding in the shade of the tree, and he was scared out of his wits. So he packed his hunting tools in a hurry and went home overnight. From then on, he never dared to hunt again ... after dividing the fields into households, he let the leeches drift with the flow, providing them with excellent growth space, making them unbridled, gradually spreading from the mountains to the outside, breeding in fields, fish ponds and ditches, bringing people a lot of trouble and making a lot of jokes. In the novel Dawn written by young people, there is a story about a leech: Suddenly, not far from Wang's right, a lesbian shouted: It turned out to be a female college student in Northeast China, who just joined the army last year and suddenly surprised people around her. I don't know what happened, but everyone stopped cutting rice, stretched out their backs and looked at the lesbian. At this time, the village women's director who was cutting rice beside Wang saw the lesbian jumping around in the field, so she immediately got up and went over to look down. It turned out that the leech was biting her calf. She said to Xie Xiaoli unhurriedly, "Don't be afraid, it's a leech. I'll help you pull it out." With that, she dipped some saliva on her right finger, lowered her head and caught the leech with two fingers stained with saliva. As soon as the leech touched saliva, it immediately fell off Xie Xiaoli's calf. At the moment, Xie Xiaoli saw this strange thing fall to the ground, and immediately breathed a sigh of relief and jumped up happily. She stepped forward and gave Li Xiuying, the director of women, a big hug. She said with shame and joy, "Really, I have never seen this ghost. It is long and soft, with no nose and no eyes. It's terrible; If it is bitter and long, I am not afraid. " Xie Xiaoli's words inadvertently caused everyone to laugh "hahaha" ...

Although leeches are hateful, they are also very fragile. A few years ago, villagers saw leeches making trouble everywhere, sucking people's blood and sweat, and there were crises everywhere, which set off a people's war to encircle leeches. Fields, fish ponds and culverts are drained of water, basked in the sun and sprayed with pesticides, leaving them nowhere to hide and kill. Although some extremely cunning leeches fled to the mountains to hide, they did not dare to make trouble rashly when they saw that all their brothers outside the mountains were killed. However, the villagers are ready. If leeches hiding in the mountains dare to make trouble again and suck people's blood and sweat, they will definitely "fight with tigers, flies and leeches" without mercy.