In the context of electrolytes, which of the following statements is true about calcium in the body?
A. Excessive amounts of calcium in the blood cause hyperexcitability of nerve and muscle fibers (tetany).
B. When given intravenously, calcium is usually administered in the form of calcium chloride or calcium gluconate.
C. A deficiency of calcium produces muscle weakness and may lead to cardiac and respiratory failure.
D. The normal serum concentration of calcium ranges between 5.0 and 6.5 mEq/l.
Answer: B
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