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Skeletal System
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Skeletal System Overview
A newborn baby has 305 bones. As a human develops to the age of 25, some bones fuse together to obtain maximum strength. The average human skeleton has 206 bones. Largest bones – Thigh (Femur) and the Upper Arm (Humerus). Smallest bones – Middle Ear (Maleus, Incus and Stapes). All bones are living organs, which contain living (cells) and non-living (mineral) materials.
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Functions of Bones Bones have 5 major functions:
Support – Provide support for tendons and ligaments and the framework for body shape. Protection – The cranium protects your brain, the ribs and sternum protect your internal organs such as heart and lungs. Movement – Bones work with muscles to produce movement. Muscles are attached to the skeleton and work by contracting (shortening) and pulling on bones. Storage – Bones are the site for storage and release of excess minerals. These are released as the body requires. Blood production – Some bones (ribs, vertebrae, humerus and femur) contain red bone marrow. This makes red cells, white cells and platelets for blood.
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Cranium Mandible Scapula Clavicle Sternum Humerus Ribs Vertebrae Radius Pelvis Ulna Carpals Metacarpals Phalanges Femur Patella Fibula Tibia Tarsals Metatarsals Phalanges
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Radius and Ulna
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Bones of the Shoulder
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Bones of the Foot
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Bones of the Foot
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