A) lowered blood \[C{{a}^{2+}}\]
B) enhanced blood \[N{{a}^{2+}}\]
C) enhanced blood glucose
D) enhanced blood \[C{{a}^{2+}}\]'
Correct Answer: A
Solution :
Parathormone released by the parathyroid gland elevates the level of \[C{{a}^{2+}}\] in blood. The deficiency of this hormone lowers blood \[C{{a}^{2+}}\] As a result, the excitability of muscles and nerves increases producing tetany sustained contraction.
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