Cadmium is not an essential element

Cadmium is not an essential element for the human body. Cadmium stimulates the respiratory tract, and after long-term exposure cadmium loses its sense of smell, forming gingival macula and gradually forming yellow circles. Cadmium compounds are difficult to absorb in the intestine, but are absorbed into the body by breathing. It is absorbed and accumulates in the liver and kidneys, causing the most overt damage especially to the kidneys (Zhang Yingying, 2019). It can also cause osteoporosis and bone softening. When cadmium enters the human body, cadmium sulfur proteins are formed in the human body, transported throughout the body by the blood, and selectively accumulated in the kidney and liver. The target organ of cadmium poisoning is the kidney, as the accumulated absorption of the kidney can reach 1/3. In addition, there is some accumulation in the spleen, pancreas, thyroid, testes, and hair. The major excretion of cadmium is fecal excretion, and small amounts are excreted in urine. The blood content of normal people is very low in cadmium, and the content of cadmium increases when it comes into contact with it, but it returns to normal immediately after the contact is stopped. Cadmium binds to protein molecules containing hydroxyl, amino, and thiol groups, affecting the normal functioning of the enzyme system in liver and kidney organs, which can interfere with many enzyme systems.