What are the 4 functions of the skeletal system?
1. Protection & support - skeletal system protects vital organs (brain, spinal cord, etc)
2. Movement (in conj with muscular system) - muscles use bones as levers
3. Maintenance of Ca2+ homeostasis - Bones are used as a source or storage form of calcium, depending on Ca2+ levels in plasma
4. Formation of blood cells - bone marrow is where blood cells are made