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1钙代谢概况钙是骨矿物质的基本组成成分,亦为细胞内许多生物反应所必需。钙在体内动态平衡的维持取决于肠道对钙的吸收和排泌、肾脏滤过和重吸收以及钙在骨骼中的贮积和动员。人体几乎所有的钙(98%)都以羟基磷灰石结晶的形式贮积在骨骼中,交换缓慢;只有少量钙(2%)是可快速交换
1 Calcium Metabolism Overview Calcium is an essential component of bone minerals and is required for many biological reactions in cells. The maintenance of calcium homeostasis depends on intestinal absorption and excretion of calcium, renal filtration and reabsorption, and calcium storage and mobilization in bone. Almost all of the human body’s calcium (98%) is stored in bone in the form of hydroxyapatite crystals, slowly exchanged; only a small amount of calcium (2%) is rapidly exchangeable