When blood calcium levels begin to drop homeostasis levels?

When blood calcium levels begin to drop, the parathyroid glands release parathyroid hormone (PTH), which stimulates the release of calcium from bones, increases calcium reabsorption in the kidneys, and promotes the activation of vitamin D to enhance intestinal absorption of calcium. This hormonal response helps restore calcium levels to their normal range, maintaining homeostasis. If calcium levels remain low, prolonged PTH secretion can lead to bone resorption and potential health issues.