Question

Which one of the following alkaline earth metal plays important role in in neuromuscular function, interneuronal transmission, cell membrane integrity, and blood coagulation?

• A. Ca
• B. Ba
• C. Be
• D. All of the above.

Answer 1

The correct option is A Ca

Ca plays an important role in neuromuscular function, interneuronal transmission, cell membrane integrity and blood coagulation.
Hence, correct option is a.
Theory
Biological Importance of Ca and Mg:

1. An adult body contains about 25 g of Mg and 1200 g of Ca compared with only 5 g of iron and 0.06 g of copper.
2. All enzymes that utilize ATP in phosphate transfer require magnesium as the cofactor.
3. The main pigment for the absorption of light in plants is chlorophyll, which contains magnesium.
4. About 99% of body calcium is present in bones and teeth.
5. The calcium concentration in plasma is regulated at about $100mg{L}^{–1}$. It is maintained by calcitonin and parathyroid hormone.
6. Ca also plays an important role in neuromuscular function, interneuronal transmission, cell membrane integrity, and blood coagulation.