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a
The secretion of PTH is regulated by the circulating levels of calcium ions.
b
Parathyroid glands alone play a significant role in calcium balance in the body.
c
Calcium ions play a very important role in clotting.
d
Calcium ions plays a vital role in the muscle contraction.
answer is B.
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Detailed Solution
Thyroid hormone, thyrocalcitonin (TCT) regulates calcium levels in the blood by decreasing it. The parathyroid glands secrete parathyroid hormone (PTH) which increases the blood Ca2+ levels and plays a major role in calcium homeostasis. TCT and PTH play a significant role in calcium balance in the body.