7. Hormone secretion:
The parathyroid gland is one of the main glands of the body that help regulate calcium, vitamin D, and parathyroid hormone levels in the blood through the interaction between bones, kidneys, and the intestine. parathyroid hormone is mainly controlled by the negative feedback of calcium as low calcium levels stimulate the release of parathyroid hormone to cause an increase in blood calcium levels by stimulating calcium release from large bones to the bloodstream, lowering its excretion rate through the kidneys, and increasing its absorption through the intestine, as well as stimulating the production of active vitamin D.
