Skeletal System The skeletal system is composed of bones, cartilage, ligaments and tendons. Together, these structures provide a structural framework for our body. Each of these structures are tissues. Thus, they continue to grow and remodel throughout the life of the organism. This unit will focus specifically on the bones, which are made up of the osseous tissues (compact and spongy types), bone marrow, cartilage and the connective tissue called periosteum . Functions The primary function of the skeletal system is support . The bones of the body provide a scaffolding in which other organs reside or muscles attach. The structure of the ears and nose are formed by cartilaginous and bony structures and the major organs are protected by bony cages. The skeletal system also provides leverage for muscular movement. Other, less well known, functions include the formation of blood in the red bone marrow and a mineral reservoir for calcium and phosphorus (as the phosphate ion PO 4 3-). The skeletal system also helps regulate pH
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