Long-term contact with solvents with high evaporation concentration and good volatility and frequent contact with intermediates that require special operation measures for breathing are harmful to human body. For example, skin burns, chronic cancer, serious will lead to shock, system disorder, all kinds of poisoning, offspring deformity and so on.
Strictly speaking, any substance is toxic. In ancient medicine, drugs have three kinds of toxicity, and in modern chemistry, water is also toxic. It depends on everyone's self-protection consciousness and pressure. Ha ha.
How harmful is pica to human body? Pica refers to the continuous intake of non-nutritive substances that ordinary people do not eat, which is more common in children's mental disorders, mental retardation and schizophrenia. Its clinical manifestations are as follows:
1. The symptoms of pica are more common in children aged 1-6, especially boys.
2. Often and repeatedly swallow non-nutritive substances, such as paint, plaster, tape, hair, clothes, etc. Older children even eat clay, feces, stones and paper.
3. Swallowing foreign bodies often leads to different complications, such as intestinal parasitic diseases caused by swallowing foreign bodies and intestinal obstruction caused by swallowing hair and stones.
4. pica gradually disappears with the increase of age and lasts until adulthood.
Some patients' symptoms are related to the lack of vitamins or minerals.
How harmful is cement to human body? Dust is the main occupational hazard in cement production, which produces a lot of dust in the process of crushing, grinding, screening, batching, kiln discharge and packaging. Generally, the content of free silica in raw meal is about 10%, that in clinker is 1.7-9.0%, and that in finished cement is 1.2-2.6%. Long-term inhalation of raw meal dust can cause silicosis, and inhalation of burnt clinker or cement dust can cause cement pneumoconiosis. Cement can generate alkaline substances such as calcium hydroxide when it meets water or sweat, which can cause dermatitis of skin and conjunctivitis and keratitis of eyes. High temperature and thermal radiation exist in the operation areas such as raw material drying and vertical kiln calcination (145℃).
How harmful is X-ray to human body □ Correspondent Intern Beibei Reporter Recently, radiation protection experts in Guangzhou and Shenzhen also called for stopping children's annual physical examination and chest X-ray examination as soon as possible. As a result, the radioactive inspection, which has always been quite mysterious, has instantly become the focus of attention. Many readers called and wrote to our reporter to ask: Is X-ray harmful to human body? How many times can X-rays cause cancer? In view of these problems, the reporter specially interviewed Associate Professor Guo Liang, director of the Department of Imaging Medicine of the First Affiliated Hospital of the Soviet Union. As soon as the staff's "X-ray storage" entered the image building of the First Affiliated Hospital of Suzhou University, the reporter found that the staff here had a "small tube" pinned to their chest. It turns out that this small tube is called "radiation measuring tube", which is specially used to measure the X-ray dose taken by professional staff every day. Every once in a while, it will be taken down to measure whether the X-ray dose taken by this staff member exceeds the standard. Director Guo told reporters that under normal circumstances, the measured results are within the normal range. A professional who has worked for many years like him has passed every test. Guo Liang said that in modern medicine, X-ray can be said to be popular, and its importance can be seen everywhere. Familiar radiological examinations, such as CT, MRI and interventional radiology, are constantly used in clinical medicine, which greatly improves the diagnostic rate of diseases. Their daily job is to check the patient's various abnormalities through the penetration of X-rays. Making a movie is equivalent to watching 1 hour of TV. When a reporter asked doubtfully whether frequent medical X-ray examinations would increase the possibility of cancer, Guo Liang first listed such a set of data. He said that the dose of X-rays taken by a human body at a time is equivalent to the amount taken by watching 1 hour TV; One dose of chest X-ray is equivalent to 0.5 times of 65438+X-ray photography; If you want to say harm, it is that a chest X-ray is equivalent to smoking three cigarettes. If receiving medical X-rays is easy to cause cancer, aren't medical professionals who work around these devices and technologies all the year round the first victims? Judging from the "radiation measuring tube" they wear to work every day, the values are generally within the normal range. That is to say, the statement that "X-ray irradiation can cause cancer several times" is unfounded. CT once a week will not affect health. As we all know, X-rays have a certain destructive effect on biological cells. Excessive exposure to X-rays will affect physiological functions, cause chromosomal abnormalities and lead to cancer. But proper irradiation will not affect human health. Because the dose used by medical staff for X-ray fluoroscopy and photography is very small, only within the safe dose. In particular, occasional chest x-ray, gastrointestinal examination, bone X-ray or angiography will not cause adverse reactions. Moreover, the X dose used for filming is not completely absorbed by people, most of it penetrates the human body, and only a small part is absorbed by the human body. If we want to say a specific value, it is that the human body really absorbs only a few tenths or even less of the dose used. Moreover, the radiation inspection equipment used in major hospitals in Suzhou, such as the First Affiliated Hospital of Suzhou University, has long been replaced by digital radiography (CR) and direct digital imaging (DR), and the radiation amount has been greatly reduced, accounting for only the original 1/7. So to be exact, it is completely correct for normal people to do ct once a week, and it will not affect their health. Director Guo emphasized that medical X-rays will never affect people's health during examination and treatment, and the public need not have any concerns.
Please accept it, thank you!
How harmful is fake egg to human body? Fake egg had better not eat it, which is the most harmful to the body. I hope you are satisfied with my answer. Thank you.
Analysis of the harm of slimming cream to human body: The ingredients of slimming cream you mentioned are unknown, which may have certain influence on your body, so it is not recommended for you to use it, and these slimming creams have no slimming effect because there is no way to help you consume body fat. Suggestion: If you want to lose weight, you should pay attention to proper diet control, do not eat high-calorie food, pay attention to do more physical exercise, and stick to it every day. Losing weight will be successful. Please refer to it.
How much harm does the camera flash do to the human body, mainly to the eyes. The subject should not look at the flash. Generally speaking, using flash will not lead to blindness, but children should pay special attention.
How big is the influence of hepatitis B on human body? Can you engage in the pharmaceutical industry? Hepatitis B is an infectious disease caused by hepatitis B virus (HBV) invading the liver. After hepatitis B virus invades liver cells, the surface of liver cells changes, which leads to the immune system attacking and destroying the liver. After acute infection with hepatitis B virus in adults, more than 90% people can clear the virus through the body's immune system, thus achieving self-healing. Unfortunately, the vast majority of HBV carriers in China are acquired through vertical transmission from their mothers, and a considerable number of infected people are chronic, which means that the vast majority of HBV carriers in China are chronic HBV carriers. Without treatment, the virus in these patients cannot be removed.
Hepatitis B itself is not terrible. What is terrible is the consequences of this disease: some patients with chronic hepatitis B are at risk of cirrhosis and liver cancer. Whether in the active stage of hepatitis or in the quiescent stage of liver disease, liver cells may have different degrees of inflammation and be destroyed continuously, especially in the active stage of hepatitis. After a long time, the injured liver will form many scars, that is, liver fibrosis, and eventually develop into cirrhosis. After the occurrence of liver cirrhosis, liver function will be seriously damaged and decompensated, and then complications such as ascites, upper gastrointestinal bleeding and encephalopathy will occur. The biggest risk is liver cancer. In patients with chronic hepatitis B cirrhosis, 2% will develop into liver cancer every year. Even hepatitis B virus carriers without obvious liver damage are still at risk of liver cancer, especially those who have been carrying the virus for more than 20 years.
Keep a clear head when treating hepatitis B.
Many patients with hepatitis B know the harm and serious consequences of hepatitis B, and their first reaction is often to cure hepatitis B anyway. Treatment of hepatitis B requires determination and a clear mind, and must not follow the medical treatment and drug advertisements of hepatitis B. According to the current progress of hepatitis B treatment in the world, so far there is no drug that can eliminate hepatitis B virus in a short time, thus curing hepatitis B. The antiviral treatment of hepatitis B is a long and complicated process. Before choosing drugs, patients with hepatitis B must consult a doctor in a regular hospital, listen to the doctor's guidance and receive standardized treatment, so as to truly get the most reasonable treatment and avoid taking fake and inferior drugs. The timing of antiviral treatment should be chosen. At present, the global treatment experience has confirmed that it is most beneficial to start antiviral treatment in the active period of hepatitis B. Therefore, patients with hepatitis B should be diligent in following up their liver function, and even in the stable period of liver function, they should strive to have a liver function examination every six months and a B-ultrasound examination every year. Once the condition changes, receive treatment as soon as possible.
Hepatitis B is difficult to treat and prevent. If we all take preventive measures, hepatitis B will not be terrible. Prevention of hepatitis B includes:
1, widely implement hepatitis B vaccination;
2. Maintain a positive attitude and optimism, and strengthen the confidence to overcome the disease;
3. Understand and master some knowledge about the prevention and treatment of hepatitis B, and develop and adhere to a good and scientific life rule;
4. Reasonably allocate nutrition and diet, avoid alcohol and tobacco, eat less greasy things and avoid constipation;
5. Pay attention to daily life and personal hygiene, change clothes according to the temperature, and actively prevent various infections;
6, actively cooperate with the doctor treatment, medication under the guidance of a doctor, regular review of liver function.
At present, doctors all over the world are trying to control hepatitis B and have made great progress. Patients with hepatitis B should not be pessimistic, disappointed and lose confidence, nor should they go their own way. As long as you pay attention to health care, closely follow up your illness and receive regular treatment, patients with hepatitis B can still work and live like normal people.
How harmful are electromagnetic waves in the air to human body? Harm of electromagnetic wave to human body
The radiation energy of electromagnetic wave is low, which will not cause material dissociation or directly destroy environmental materials. However, in modern life full of electronic communication equipment, its electromagnetic interference characteristics can not be taken lightly, because it may make people face dangerous situations at any time. Harm of electromagnetic waves After using the computer for a long time, you will feel tired, eye fatigue, shoulder pain, headache, drowsiness and anxiety, all of which are affected by electromagnetic waves. Electromagnetic waves can also reduce people's immune function, reduce calcium in the human body, cause abnormal production, abortion, visual impairment, and hinder cell division such as cancer, leukemia and brain tumor. In addition, electromagnetic waves will emit a positive ion that disturbs the state of the human body.
Experimental research and investigation results show that the harm of electromagnetic radiation to health is multifaceted and complicated, and the main hazards are:
1. Harm to central nervous system
The nervous system is very sensitive to electromagnetic radiation. After repeated exposure to low-intensity electromagnetic radiation, the function of the central nervous system changes, resulting in neurasthenia syndrome, mainly manifested as headache, dizziness, fatigue, memory loss, sleep disorder (insomnia, dreaminess or lethargy), daytime dozing, irritability, sweating, palpitation, chest tightness, hair loss and so on. , especially difficulty falling asleep, fatigue, sweating, and memory loss. The poor coordination between hand and brain shows that the speed of marking numbers is slow and there are many mistakes.
2. Damage to the body's immune function
Animal experiments and investigations on human radiation exposure show that the percentage and number of bacteria swallowed by white blood cells in human body are reduced. In addition, the antibody formation of people exposed to electromagnetic radiation for a long time is obviously inhibited.
3. Effects on cardiovascular system
People exposed to electromagnetic radiation often have hemodynamic imbalance, vascular permeability and tension decrease. Because the autonomic nerve regulation function is affected, people often show symptoms of bradycardia, and a few show tachycardia. The victim's blood pressure fluctuated, began to rise, then returned to normal, and finally appeared hypotension. The decrease of R T wave voltage in ECG is the result of vagus nerve allergic reaction and myocardial malnutrition. p？ Q prolonged and P wave widened, indicating that atrioventricular conduction was poor. In addition, cardiovascular diseases of people exposed to electromagnetic radiation for a long time will be earlier and easier to promote their occurrence and development.
4. Influence on blood system
Under the action of electromagnetic radiation, the peripheral blood picture may appear leucocyte instability, mainly the downward trend and leukopenia. Erythropoiesis was inhibited and reticular erythropenia appeared. The health survey results of people who operate radar show that most people have leukopenia. In addition, when radio waves and radiation act on the human body at the same time, the impact on the blood system can be more obvious than a single factor.
5. Effects on reproductive system and heredity
People who have been exposed to ultrashort wave generators for a long time may have male sexual dysfunction and impotence; Women have menstrual cycle disorder. Due to the poor blood circulation of testis, it is very sensitive to electromagnetic radiation, which inhibits the production of * * * and affects fertility; It denatures the egg cells, destroys the ovulation process and makes women lose their fertility.
High-intensity electromagnetic radiation can produce genetic effects, leading to chromosome aberration and abnormal mitosis in testis. Pregnant women receive short-wave diathermy treatment in the early stage or before pregnancy, which leads to congenital birth defects (deformed babies) in their offspring.
6. The influence of visual system
Eye tissue contains a lot of water, which is easy to absorb electromagnetic radiation power, and the blood flow in the eye is small. Under the action of electromagnetic radiation, the eye temperature is easy to rise. Temperature rise is the main condition leading to cataract, which leads to protein condensation of the lens of the eye. Most scholars believe that the long-term effect of low-intensity microwave can accelerate the aging and opacity of lens, and may shorten the colored field of vision and prolong the dark adaptation time, resulting in some visual obstacles. In addition, the long-term effects of low-intensity electromagnetic radiation,
7. Carcinogenesis and electromagnetic radiation carcinogenesis
Most experimental animals can increase the incidence of cancer after microwave irradiation. Some microwave biologists' experiments show that electromagnetic radiation can cause mutation and mitosis abnormality of chromosomes and microparticle cells in human body, thus leading to pathological proliferation of some tissues and turning normal cells into cancer cells. The staff of an American embassy abroad were exposed to high electromagnetic radiation from microwave eavesdropping for a long time, which led to the increase of white blood cell count of the staff of the embassy. The incidence of cancer is higher than that of normal people. For example, under the influence of high-power long-range microwave radar, the number of local cancer patients has increased dramatically. The heating effect of microwave on human tissues can be used not only for physical therapy, but also for the treatment of cancer, which increases the central temperature of cancer tissues and destroys the proliferation of cancer cells.
In addition to the above health hazards, electromagnetic radiation also has adverse effects on endocrine system, hearing, substance metabolism and morphological changes of tissues and organs.
How harmful is rubber vulcanization to human body? Rubber is generally non-toxic, and many vulcanizing agents, accelerators and antioxidants are also non-toxic. However, in the process of high-temperature vulcanization production, pungent smells, such as hydrogen sulfide and sulfur dioxide, will be produced, which will be uncomfortable to smell, and long-term contact will cause certain harm to the respiratory tract.
Pay attention to wearing a mask, preferably with an activated carbon filter.
Usually at home, it is recommended to eat more lung-clearing foods, such as vegetables and pig blood, or try to move in places with thin rubber smell. A slight smell has little effect on the human body.