Question

The excessive amount of calcium is regulated by

• A. Thyroxine
• B. Calcitonin
• C. Epinephrine
• D. Progesterone

Answer 1

The correct option is B Calcitonin

When the blood level concentration rises above the normal level, the parafollicular cells of the thyroid gland releases an enzyme named calcitonin in order to bring the blood calcium level under normal range. Calcitonin is a polypeptide hormone made up of 32 amino acids. It neutralizes the effect of parathyroid hormone, thus lowering the blood calcium level in blood. It reduces the calcium level by increasing the absorption of calcium by the bones, reducing the absorption of calcium in kidney and intestines and increasing calcium excretion in the urine.

So option B is the correct answer.