A) \[F{{e}^{2+}}\]
B) \[M{{g}^{2+}}\]
C) \[N{{a}^{2+}}\]
D) \[C{{a}^{2+}}\]
Correct Answer: A
Solution :
Haemoglobin is a respiratory pigment found in RBCs. It contains iron \[(F{{e}^{2+}})\]. Bones contain large amount of calcium phosphate. \[C{{a}^{2+}}\] are needed for stability of cell membrane, as cofactor for some enzymes and are involved in muscle contraction and blood clotting. \[M{{g}^{2+}}\] acts as enzyme cofactor and involved in transmission of nerve impulses. \[N{{a}^{+}}\] is important in determining the balance of electrical charges in body fluids.
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