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NUTRIENTS FOR YOUR BODY: GENERAL FUNCTIONS OF MINERAL ELEMENTS
For convenience mineral elements are often discussed separately. However, within the body they function together in building body tissues and in the regulation of body metabolism. Some of the important ways in which mineral elements function together are discussed below. Specific functions will also be listed under the headings for each element.
Bone formation
Bone consists of a soft, pliable, but tough protein material into which minerals are deposited. Most of the calcium, phosphorus, and magnesium, and smaller amounts of other mineral elements, are deposited in the bones and teeth. During the last two months of pregnancy most of the ossification of the bones of the fetus occurs. The infant at birth has a well-formed skeleton, but the bones are still quite soft. Throughout childhood, adolescence, and into the early twenties the bones continue to harden as well as to grow in length and in diameter. The individual who has ample calcium, phosphorus, and protein in his diet during the growing years will be taller than the one who is poorly nourished.
As well as providing the framework for the body, bones serve as a storehouse for the mineral elements they contain. They are never fixed for life. The blood can withdraw mineral elements from the bone according to the daily soft-tissue and fluid needs of the body. These withdrawals are ordinarily replaced from the diet.
Tooth formation
Teeth, like bones, contain a ground substance of protein. The tooth enamel and dentine are hard substances containing appreciable amounts of calcium and phosphorus. The first teeth form in the fetus at the fourth to sixth week of pregnancy and begin to calcify by the twentieth week. The permanent teeth calcify soon after birth up to about three years of age. Wisdom teeth may calcify as late as eight to ten years of age. The teeth are fully mineralized before they erupt. The enamel and dentine are not supplied with blood vessels. Therefore, a decayed tooth cannot repair itself, so that proper care of the teeth once they have erupted is vital.
Soft tissues
Contain many mineral elements in their structure, including potassium, sulfur, phosphorus, iron, and others.
Vitamins, enzymes, and hormones
Minute amounts of mineral elements are constituents of the various regulatory compounds. Sulfur is a part of the thiamin molecule and cobalt is present in the vitamin B12 molecule. Zinc is part of the enzyme (carbonic anhydrase) that releases carbon dioxide from the red blood cells. Iodine is present in the thyroxine molecule.
Some mineral elements are needed to change an inactive enzyme to its active form; for example, calcium activates pancreatic lipase, an enzyme that splits fats in the digestive process. In other instances a mineral element is necessary to catalyze (speed up) a reaction. Copper is needed to incorporate iron into the hemoglobin molecule, just as zinc is necessary for the formation of insulin by the pancreas.
Nervous response and muscle contraction
Body fluids contain exact amounts of sodium, potassium, calcium, and magnesium. These elements control the passage of materials into and out of the cells. They regulate the transmission of the nerve impulses, and the contraction of the muscles.
Water balance
The balance of fluid between the inside and the outside of each cell depends in large part upon the correct concentrations of sodium and potassium. Sodium occurs primarily in the extracellular fluid, and potassium is found chiefly in the intracellular fluid.
Acid-base balance
The body fluids are maintained at a constant pH at all times. The pH is a measure of the acidity or alkalinity.
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