Skeletal System
Skeletal Functions


Types of Skeletons
Skeletal Functions
Types of Bones
Structure of Long Bones
Microscopic Structure
Skeletal Development
Axial Skeleton
Appendicular Skeleton
Interactive Skeleton
Diseases, Disorders and Fractures

Protection - protects organs behind the bones (ex: skull - brain, ribs - heart and lungs)
Support - provides a framework that gives shape to the body; the spine and legs support the entire weight of the body
Movement - bones act as levers for the muscles which create movement
Blood Cell Formation (Hemopoiesis) - red blood cells are created within the bone marrow of some long bones
Storage - the bones store calcium, phosphorus and other minerals for later use in the body
          - A Negative Feedback loop can be seen here.  When the blood calcium concentrations drop due to decreased calcium intake, the bones release stored calcium deposits into the blood to return levels to normal.  This is a negative feedback loop because opposing actions occur to return the body to homeostasis.  This feedback loop can also lead to Osteoporosis if calcium intake is not increased for an extended amount of time.