The skeleton constitutes the internal structural framework of many complex organisms, providing essential support and maintaining the body's overall shape. This system is composed of bones and cartilage, which are specialized connective tissues. Functionally, the skeletal system serves to protect delicate internal organs, act as leverage points for muscular movement, and maintain mineral homeostasis by storing vital elements such as calcium and phosphorus. The structure provides the necessary rigidity against physical forces while also offering a framework for blood cell formation within specialized cavities.