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Calcium

Meaning

Calcium is an essential mineral and electrolyte, represented by the chemical symbol Ca2+, serving as a structural component of the skeletal system and a vital second messenger in numerous cellular signaling pathways, including muscle contraction and hormone secretion. Its physiological concentration in the extracellular fluid must be tightly regulated to maintain neuromuscular excitability and systemic function. This divalent cation is integral to both mechanical strength and cellular communication.