This ions could be positive or negative, they are formed because the atom gained or lost some electrons in their internal structure.
In the human body, they are very common because they are constantly formed, for example in our cells membranes, we need some potassium and calcium ion to transport water inside the cells.
Also this ions are formed when we eat food during digestion process, some of this ions are the responsible for aging.
Electrolytes produce ions and enable the body to function
Body fluid contains electrolytes, chemicals which, when they dissolve in water, produce charged ions. These ions enable the flow of electrical signals through the body.
