Calcium

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Definition of Calcium:
(Ca) metallic element that occurs in many rocks and in seawater and is an essential macronutrient. As Ca+ it is an important regulatory ion in living cells, involved e.g. in regulation of enzyme activity, stimulation of muscle contraction, and control of secretion. As calcium salts (e.g. calcium phosphates), it is a major constituent of bone.[1].
This is the common definition for Calcium, other definitions can be discussed in the article

References

  1. Lawrence, E. (2005). Henderson’s dictionary of biology. Pearson Education Limited, 13th ed., Harlow. 748 p.