In response to low levels of calcium the parathyroid glands release a hormone that dissolves some of the calcium in the bones moving it into the blood. This is an example of?

This is an example of hormonal regulation of calcium homeostasis. The hormone released by the parathyroid glands is parathyroid hormone (PTH), which increases blood calcium levels by promoting the release of calcium from bones, enhancing intestinal absorption of calcium, and reducing calcium excretion in the kidneys. This process is crucial for maintaining stable calcium levels in the body, which are essential for various physiological functions.