Topic content:
Elements in the form of inorganic salts can be divided into ______________________ and trace elements according to their ___________________________ in the human body. Trace elements are divided into three categories: ___________________________, ___________________________ and ___________________________.
Best answer:
Content; Constant element; Required element; Non required elements; Harmful element
Answer analysis:
There is no explanation for this question
Test core:
The existence form of elements in human body:
① Carbon, hydrogen, oxygen and nitrogen mainly exist in the form of water, sugar, protein, vitamins and fat.
② Other elements mainly exist in aqueous solution in the form of inorganic salts.
③ Calcium element mainly exists in the form of hydroxycalcium phosphate [Ca10 (PO4) 6 (OH) 2] crystal.