Minerals, which make up approximately 4% of body weight, are necessary to help the body perform many of its functions, including building bones and transmitting nerve impulses. There are two types of minerals: macrominerals and trace minerals. The body needs smaller amounts of trace minerals, for example, iron and zinc, than it does macrominerals, which include potassium and calcium. Electrolytes control the fluid balance of the body. They are essential in muscle contract
 
 
Recommended Resources
Describes the balance which is important between fluids and electrolytes, including dangers and damage that can occur if they are not balanced.
http://www.nlm.nih.gov/medlineplus/fluidandelectrolytebalance.html
Merck: Minerals and Electrolytes
Overview of the importance of minerals and electrolytes as well as a breakdown of different types of each. It also contains a chart of minerals and their functions and recommended dietary allowance for adults and the safe upper limits.
http://www.merckmanuals.com/home/ag/sec12/ch155/ch155a.html
The Effects of Dietary Minerals and Electrolytes on the Growth and Physiology of the Young Chick
Presents the results of a study of minerals and electrolytes as they affect the growth of young chickens. It is available in html as well as PDF format and contains a link to similar articles.
http://jn.nutrition.org/cgi/content/abstract/115/12/1680