Parathyroid glands.

The parathyroid glands are small glands, usually four, embedded in the back of the thyroid.

These glands produce parathyroid hormone hormone, which regulates the level of calcium and phosphorus in the blood and bones. The parathyroid hormone tends to increase the concentration of calcium in the blood by increasing bone decay. This hormone has the opposite effect of calcitonin (tirocalcitonina), which is secreted by the thyroid gland. Calcium plays a very important role in many metabolic processes, too much calcium (hypercalcemia) or too little (hypocalcemia) can alter the normal operation of,,, parathyroid hormone helps maintain homeostasis calcium in the blood. The body cells are very sensitive to changes in the amount of calcium in the blood.