Question

Calcium level decreases in the blood due to hyposecretion of

• A. Parathyroid hormone
• B. Calcitonin
• C. Thyroxine
• D. Adrenaline

Answer 1

Answer: (A)

Parathyroid hormone

Parathormone of parathyroid gland reduces the blood phosphate level while increases the blood calcium level. Therefore, hyposecretion of parathyroid hormone decreases the blood calcium level which makes option A correct.

Calcitonin hormone, secreted by the thyroid gland in response to increased blood calcium level, stimulates a temporary reduction in number and activity of osteoclasts and thereby reducing the blood calcium level to normal. This makes option B incorrect as hyposecretion of calcitonin increases blood calcium level.

Thyroxine is thyroid hormone which targets all tissues and stimulates metabolic rate, growth and development. Adrenaline is an emergency hormone which prepares the body for fight or flight response by intensifying the effect of sympathetic stimulation. Thyroxin and adrenaline do not affect the blood calcium level which makes options C and D incorrect.

Therefore, the correct answer is option A.