Here's why:
* Bones as Calcium Reservoirs: Bones are the primary storage sites for calcium in the body. They contain a mineral called hydroxyapatite, which is composed of calcium and phosphate.
* Regulation of Calcium Levels: The skeletal system plays a crucial role in regulating blood calcium levels. When blood calcium levels drop, the parathyroid hormone (PTH) stimulates the release of calcium from bones into the bloodstream. When levels are high, calcitonin hormone promotes calcium storage in bones.
While other systems are involved in calcium metabolism (like the digestive system for absorption and the kidneys for excretion), the skeletal system is the primary storage and regulatory system for calcium.
