What selenium is an essential trace element in human and animal life activities

Selenium is a chemical element with the chemical symbol SE, a non-metal. It can be used as a photosensitive material, a catalyst for the electrolytic manganese industry, an essential nutrient element for the animal body and a beneficial nutrient element for plants.

A large number of clinical experiments at home and abroad have proved that selenium deficiency in the human body can cause dysfunction of some important organs, resulting in many serious diseases, more than 40 countries in the world are in selenium-deficient areas, hundreds of millions of people in 22 provinces in China are in selenium-deficient or low-selenium areas, the population in these areas has a high incidence of tumors, liver diseases, cardiovascular diseases, etc., studies have shown that people with low selenium or selenium deficiency can not only prevent the occurrence of tumors and liver diseases through appropriate amounts of selenium supplementation, but also can improve the body's immunity and maintain the heart, liver, lungs, Normal function of important organs such as the stomach to prevent the occurrence of senile cardiac and cerebrovascular diseases.

Selenium not only has a wide range of uses in the industrial field and plays an important role, but also has been proven by modern science to be one of the essential trace elements in human and animal life. Appropriate amounts of selenium play an important regulatory role in maintaining the normal metabolism of mammals, and only by maintaining a certain amount of selenium can organisms maintain health.

Selenium was discovered in 1817 by the Swedish chemist Bezelius in the residue of the examination of sulfuric acid, named after the goddess of the moon (seleniun) in ancient Greek mythology. In 1961, a micro-test for selenium was invented, which can easily track the activity of selenium in human metabolism. Since then, Roduluc has traced the role of selenium in animal control, linking selenium to glutathione peroxidase, and in 1973 reported that selenium is the active ingredient of glutathione peroxidase.

This discovery revealed the biochemical role of selenium and made it clear that selenium is an essential trace element in human and animal life activities.

In recent years, scientists and medical workers have continuously discovered that selenium is closely related to human health, and scientifically confirmed that all important organs of the human body, including the heart, liver, kidneys, pancreas, etc., need a certain amount of selenium to maintain normal function. At the same time, scientists have found that selenium deficiency can lead to more than 40 diseases, such as cancer, anemia, cardiovascular and cerebrovascular diseases, liver disease, diabetes, prostate disease, cataracts, stunted growth in children, neonatal immunodeficiency, infertility, premature aging, etc. Tests have proved that selenium is a protective factor against nutritional hepatic necrosis and has a strong protective effect on the liver.

In view of this, in 1973, the United Nations Health Organization officially declared that selenium is an indispensable trace element in human and animal life activities.

According to a large number of studies at home and abroad, the lack of selenium in the human body will lead to the occurrence of many serious diseases. Some studies believe that selenium has a certain resistance effect, and is also known as the "inhibitor" of disease, which can effectively help the human body resist disease from these five aspects.

Foods high in selenium include butter, fish meal, lobster, mushrooms, pork kidney, garlic, etc. Although selenium contains some elements, its absorption rate is not ideal. Such as selenate polysaccharides, selenium yeast, selenium eggs, selenium-rich mushrooms, selenium-rich malt, selenium-rich gastrodia, selenium-rich tea, selenium-rich rice, etc.

Selenium is an important component of antioxidants in red blood cells. Sufficient selenium effectively converts hydrogen peroxide into water in the human body. In addition, various selenium-containing enzymes can regulate the work of the thyroid gland and participate in the synthesis of amino acids.

Selenium-containing foods include red beans, kidney beans, and mung beans, and cereals include wheat germ flour and corn flour. Vegetables containing selenium include garlic, coriander, rape, spinach, leeks, and cabbage, and fruits include apples, grapes, apricots, etc. Eggs, pork, and chicken all contain some selenium.

Shrimp and fish also contain some amounts of selenium. Eggs are high in selenium, such as eggs, goose eggs, duck eggs, etc. Chicken eggs are one of the best for selenium.

The kidneys, hearts, and livers of animals are rich in selenium, such as pig kidneys, sheep kidneys, pig hearts, etc.

Oysters, dried shrimp, dried shrimp, cuttlefish, sea cucumbers, lobsters, fish and shellfish, etc. Egg foods are very rich in selenium, such as eggs, duck eggs, goose eggs and other foods, and the selenium content of such foods is incomparable to other foods. In order:

Goose eggs, duck eggs, eggs. The selenium content per 100 grams of goose eggs is micrograms; Duck eggs contain micrograms of selenium per 100 grams; Eggs contain micrograms of selenium per 100 grams. Judging from the selenium content, eggs are a good choice for selenium supplementation.

For example, foods such as eggs, duck eggs, and goose eggs contain selenium that is difficult to compare with other foods.

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Selenium-free foods include butter, fish meal, Tatsuno Douzi shrimp and mushrooms, but its absorption rate is not ideal, an important component of oxidants in Western-style red blood cells, enough selenium energy, effective oxidation to water in the human body, selenium-containing foods include red beans, kidney beans, mung beans, cabbage, fruits, apples and grapes, muscle selenium content is the highest, chicken is one of the best selenium sales.

The first kidney rent, the second seafood, the third rye flour, the fourth banana, the fifth onion, the sixth garlic, and the seventh, the meat that is rich in selenium.

Red beans, mung beans, cornmeal. Garlic, coriander. Animals, offal, seafood and other foods are rich in selenium. If you are missing, you can eat more of these kinds of food.

When was the idea that the trace element selenium is an essential element for the human body proven? In the 30s of the century, the Australian research institute proved the relationship between selenium and peeling disease in livestock.

In the 40s of the century, German scientists discovered that garlic factor for liver disease contains selenium.

In the 50s of the century, American research proved that the key element of garlic factor is selenium.

In the 20s of the century, Swedish scientists discovered the element selenium.

Correct answer: c

a It can be seen from the Chinese character "stone" in the name of selenium that it is a non-metallic element, so it is wrong;

b According to the information obtained in a box in the periodic table, the atomic number of this element is 34, so it is correct;

c In the atom, the number of nuclear charges = the number of protons = the number of electrons outside the nucleus, the number of nuclear charges of the selenium atom is 34, so there are 34 protons in the nucleus and 34 electrons outside the nucleus, which has nothing to do with the number of neutrons, so it is false;

d The unit of relative atomic mass is not "g" but "1", which is usually omitted and not written, so it is wrong to choose b