What are bones and joints and what are their functions?  

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Bones are a connective tissue.  They support the body and protect certain vital organs such as the brain, heart and lungs.  They store minerals and lipids.  They produce red and white blood cells and they function as a lever to move your body. 

Joints are where two or more bones...

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Bones are a connective tissue.  They support the body and protect certain vital organs such as the brain, heart and lungs.  They store minerals and lipids.  They produce red and white blood cells and they function as a lever to move your body. 

Joints are where two or more bones meet together.  Some joints don't move at all.  Some move slightly and some are freely movable.  Immovable joints would be like the bones of the skull.  Slightly movable joints would be like the joint between the tibia and fibula (bones of the lower leg).  Freely movable joints would be like your shoulder or hip.  Freely movable joints are subcategorized even further based on the type of movement they do.  Some examples of these are hinge, gliding, pivot, ellipsoidal, saddle and ball and socket.

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