Bone as structures and bone as an organ
Two different point of view of bone :
1. Individual bone are anatomical structure
2. Bone of entire skeleton collectively is a physiological organ (metabolically active)
As structures make enable them to serve three functions :
a. to provide the rigid framework for the trunk and extremities to withstand mechanical loads
b. to serve as levers for locomotor function of skeletal muscles
c. to afford protection for vulnerable viscera
As an organ serves two additional functions :
a. it contains hemopoetic tissue of the myeloid for the production of erythrocytes, granular leukocytes, and platelets
b. it is the organ of storage or reservoir for calcium, phosphorus, magnesium, and sodium
(from Salter RB. Textbook of Disorders and Injuries of The Musculoskeletal System)
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The Beauty of Bones 
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