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The system is composed of bones and cartilage.
A living tissue, highly specialized, hard form of connective tissue that forms the skeleton. It acts as the main support tissue of the body. It provides:
> Protection for vital structures
> Support for the body
> mechanical basis for movement
> Storage for salts, e.g. calcium
> Continuous supply of new blood cells
Cartilage – a resilient, semi-rigid form of connective tissue, forming part for motion. Has no capillary blood supply of its own. Oxygen and nutrition comes from long ranged diffusion. Articulation comes from synovial joints with articular cartilage providing a gliding motion.
Axial skeleton – bones of the head (skull), neck (hyoid), and trunk (ribs, sternum, vertebrae, sacrum)
Appendicular skeleton – bones of the limbs, pectoral and pelvic girdle.
Living bones have some elasticity ( flexibility) and rigidity ( hardness)
compact = body or shaft
spongy or cancellous (medullary cavity or marrow)
Long bones = tubular,e.g. humerus
short bones = cuboidal ( ankle, tarsus and wrist, carpus)