Tetany refers to sudden and uncontrolled muscle contractions primarily caused by 

Tetany refers to rapid spasms (wild contractions) in muscle due to low Ca⁺⁺ in body fluid. 

High potassium levels in the blood are not the primary cause of tetany. 

Deficiency of dystrophin protein is associated with muscular dystrophy, not tetany. 

Low calcium levels in the sarcoplasm may decrease instead of increasing muscle contraction.