In the cell itself, sodium is low and potassium high. When stimulated, the membrane changes it permeability. An electrical impulse results. Calcium and magnesium ions play a key role in regulating nerve and muscle membrane behavior. Dietary consequences for improper intake of salts and water are manifest as loss of nerve and muscle function.
Chloride is an ion that usually passively follows the movement of positively charged ions.
C. Muscle contraction involves both membrane regulation of salt concentration and the participation of calcium in the act of muscle fiber shortening and elongation. Irregular contractions of the heart, arrythmias are associated with altered salts Low serum Ca can upset muscular contractility. D. Structural integrity of tissues and bones depends primarily on calcium and phosphate The insoluble mineral of bone is primarily calcium and phosphate. Inadequate calcium compromises bone maintenance. Calcium deficiency is a serious dietary problem among young and old alike.