The human skeleton is an internal framework composed of bones and cartilage that provides support, shape, and protection to the body. It plays several critical roles, including:
1. **Support**: The skeleton gives structure to the body and supports soft tissues and organs.
2. **Protection**: It encases vital organs, such as the brain (skull), heart and lungs (ribcage), and spinal cord (vertebral column).
3. **Movement**: Bones serve as levers