Which of the following is NOT a main function of bone?

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The main concept being tested is the diverse roles of bone in the body, including structural support, protection of organs, hematopoiesis, and mineral storage. The option describing storage of sodium isn’t a primary bone function because bones mainly store minerals like calcium and phosphate and provide a site for blood cell formation in the marrow. Sodium balance is controlled largely by the kidneys and extracellular fluid, not by the skeletal system. The other functions—blood cell formation in bone marrow, protection of vital organs, and providing a rigid framework to support the body—are classic and central roles of bone.