Multiple choice Which one of the following hormones is INCORRECTLY paired with its function? Melatonin - biological rhythm Glucagon - increases blood glucose levels Prolactin - stimulates milk secretion Calcitonin - increases blood calcium level Reveal answer Fill a bubble to check yourself D Correct answer Explanation Calcitonin acts to decrease blood calcium levels by inhibiting osteoclast activity and promoting calcium excretion, making the statement that it increases blood calcium levels incorrect.