What is the primary function of calcitonin in the body?

Calcitonin primarily functions to inhibit bone resorption, which is the process by which osteoclasts break down bone tissue, leading to the release of calcium into the bloodstream. This hormone is produced by the parafollicular cells (C cells) of the thyroid gland and plays a crucial role in maintaining calcium homeostasis. By inhibiting bone resorption, calcitonin helps lower blood calcium levels, counteracting the effects of parathyroid hormone (PTH), which raises blood calcium levels.

This hormonal balance is essential for various bodily functions, including muscle contractions and nerve signaling. The management of calcium levels through the action of calcitonin is particularly important in preventing conditions such as osteoporosis, where excessive resorption can weaken bones. Understanding this function helps underscore the importance of calcitonin in calcium metabolism and overall skeletal health.