________ is a thyroid hormone which controls the balance of calcium in the body.
A
Calcitonin
B
Thyroxine
C
Calmodulin
D
All of these
Correct Answer: Calcitonin
Calcitonin is a hormone that is produced in humans by the parafollicular cells (commonly known as C-cells) of the thyroid gland. Calcitonin is involved in helping to regulate levels of calcium and phosphate in the blood, opposing the action of parathyroid hormone.