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钙、镁在人体细胞外液的含量仅次于钠、钾、属常量元素而占第三、四位。钙主要参于骨骼和牙齿的构成,维持骨骼正常功能,参于骨骼的修复,降低毛细血管的通透性和神经肌肉兴奋性,并参于肌肉的收缩以及血液凝固的过程等。镁离子是某些酶的激动剂如:焦磷酸酶、碱性磷酸酶、三磷酸腺苷酶和和一些肽酶等。因此,镁在糖、蛋白质代谢具有重要的作用。有一种缺镁性搐搦症,其特征是血清镁减低(为0.3～1.5mEg/L)而血钙正常。所以
Calcium, magnesium in human extracellular fluid content of sodium, potassium, is a constant element and the third and fourth place. Calcium is mainly involved in the composition of the bones and teeth, to maintain the normal function of bone, involved in the repair of bone, reduce capillary permeability and neuromuscular excitability, and participate in muscle contraction and blood coagulation process. Magnesium ions are agonists of certain enzymes such as pyrophosphatase, alkaline phosphatase, adenosine triphosphate and some peptidases. Therefore, magnesium in the sugar, protein metabolism has an important role. There is a lack of magnesium convulsions, characterized by reduced serum magnesium (0.3 ~ 1.5mEg / L) and normal serum calcium. and so