求翻译：摘要：钙是人体重要的元素成分之一，在人体内以两种形式存在：结合状态和离子状态（Ca2+）,但是只有Ca2+才具有生理活性和生理学功能。结合态的钙是人体骨骼和牙齿的主要成分。而游离态的钙主要参与一些生理过程如：血凝作用、细胞壁渗透作用、钙在神经冲动传递中起一定作用、多种酶的激活剂、钙还与人体的消化、免疫、排毒以及皮肤弹性相关。是什么意思？

Abstract: Calcium is one of the important human element composition in the human body exists in two forms: combination of state and ionic state (ca2 +), but only in ca2 + with physical activity and physiological functions. Bound calcium is the main component of human bones and teeth. Free ions of ca

Summary: Calcium important elements of the human body is one of elements in the human body, and exists in two versions: with status and ion status (Ca 2+ ), but only Ca 2+ have physiological activity and physiological function. Combined with state of the body, calcium in bones and teeth. Free radica

Abstract: The calcium is one of human body important elemental compositions, in human body by two form existences: Bound state and ionic condition (Ca2+), but only then Ca2+%

Abstract: calcium is one of the important elements in the human body, human body exists in two forms: combining State and Ionic State (Ca2+), but only Ca2+ with physical activity and physiological functions. Binding of calcium is the main component of human bones and teeth. While free calcium mainly