PATHOLOGY

Detailed explanation-1: -Calcitonin is a hormone that your thyroid gland makes and releases to help regulate calcium levels in your blood by decreasing it. Calcitonin opposes the actions of the parathyroid hormone, which is a hormone that increases your blood calcium levels.

Detailed explanation-2: -When levels of calcium in the blood decrease, this causes the amount of calcitonin secreted to decrease too. The secretion of calcitonin is also inhibited by the hormone somatostatin, which can also be released by the C-cells in the thyroid gland.

Detailed explanation-3: -Calcitonin lowers blood calcium levels by suppressing osteoclast activity in the bones and increasing the amount of calcium excreted in the urine. The hormone also prevents the absorption of calcium from the intestine, as well as increasing the calcium absorbed by the kidney.