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BONES AND BONE TISSUE Functions: 1. Support: provides framework that supports and anchors all soft organs. Leg bones act as pillars to support the body trunk, and the ribs support the thorax wall. 2. Protection: skull and vertebrae surround soft tissue of the nervous system, and the rib cage protects vital thoracic organs. 3. Movement: skeletal muscles use the bones as levers to move the body. 4. Storage: fat stored in the interior of the bones. Bone matrix serves as a storehouse for various minerals. 5. Blood Cell Formation : hematopoiesis occurs within the marrow cavities of the bones. Classification of Bones: Bones can be classified by the two types of osseous tissue. Bones of different shapes contain different proportions of the two basic types of osseous tissue (compact & spongy bone). Compact bone is dense and looks smooth and homogeneous. Spongy bone is composed of small needlelike or flat pieces of bone called trabeculae and has much open space. The trabeculae form an open network which is filled with bone marrow.
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