Question

How do hormones from the thyroid and parathyroid regulate the calcium concentration of the blood?

Answer 1

Calcitonin helps in lowering the level of calcium in blood by depositing excess calcium in bones and by preventing the mixing of calcium from the bones with blood. Calcitonin also helps in the excretion of the excess of calcium through the kidneys in the urine. However, the parathormone, secreted by the parathyroid glands, is responsible for increasing blood calcium levels by absorbing calcium to the blood from the kidneys. Both calcitonin and the parathyroid gland are antagonistic (opposite) to each other.