What role does calcium play in the skeletal system?

Calcium is crucial for the skeletal system primarily because it is a key component of bone tissue, contributing to bone strength and density. This mineral provides the rigidity and structure that are essential for maintaining the overall integrity of the skeleton. In addition to its role in bone health, calcium is also vital for muscle contraction. When a muscle receives a signal from the nervous system to contract, calcium is released within the muscle cells, facilitating the interaction between proteins that lead to muscle shortening and contraction. Therefore, the answer recognizes both the structural importance of calcium in bones and its essential role in muscle function, illustrating a fundamental aspect of musculoskeletal physiology.