Answer:
Body fluid has electrolytes, they are chemicals that dissolve in water and then produce charged ions.
Electrolytes play an important role in our body and there are many of them.
The main electrolytes include chloride, potassium, calcium, sodium, and magnesium.
For example Sodium ions (Na+)
Function in our body: regulate osmotic pressure and the content of water of our body, transmit nerve signals, contract muscle, etc.
That is one type of ion.