Question

The blood calcium level is lowered by the deficiency of

• A. Both calcitonin and parathormone
• B. Calcitonin
• C. Parathormone
• D. Thyroxine

Answer 1

Answer: (C)

Parathormone

Calcitonin hormone stimulates the temporary reduction in number and activity of osteoclasts and thereby reducing the blood calcium level to normal. Its deficiency leads to higher blood calcium level. Parathyroid gland secrets parathormone which serves antagonistically to calcitonin and increases the blood calcium level. Deficiency of parathormone leads to lowered blood calcium level. Thyroxine regulates the basic metabolic rate of all cells. Thus, the correct answer is option C.