Skeletal System
골격계
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<speciesfyi-glossary slug="skeletal-system"></speciesfyi-glossary>Definition
The framework of bones and connective tissue that provides structural support, protection, and movement in vertebrates.
Detailed Explanation
Beyond mechanical support, the skeleton serves as a mineral reservoir — bones store 99% of the body's calcium and phosphorus. Red and white blood cells are produced in bone marrow, linking the skeletal and immune systems. Bone is dynamic living tissue, constantly remodeled in response to mechanical stress — astronauts lose bone density in microgravity, while athletes develop denser bones.