What is the main purpose of the parathyroid gland?

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Calcium homeostasis is what the parathyroid glands manage. When blood calcium falls, they release parathyroid hormone, which raises calcium by acting on bone to release calcium, on the kidneys to reabsorb calcium, and by promoting the production of active vitamin D to boost intestinal calcium absorption. This keeps calcium levels stable, supporting nerve signaling and muscle function, which is essential in neurosonology practice.

Regulating glucose levels is the job of pancreatic hormones; producing thyroid hormones is the function of the thyroid gland; and controlling metabolism is largely driven by thyroid hormones.