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Biol129_C6 - The Skeletal System Background The skeletal...

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1 The Skeletal System Background The skeletal system is composed of: – Bones & Cartilage Bones provide: – Support – Framework of levers for motion – Organ protection – Storage of minerals Ca +2 and PO 4 -3
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2 Cartilage Flexible, semirigid CT Appears where flexibility required – Ex: Costal cartilage Ribs->Sternum Appears on articulating surfaces – Provides smooth friction-free surface A precursor to bone, calcification – Newborns & kids are much more flexible than adults Cartilage - 2 Cartilage is dense; vessels do not penetrate it so… – Cartilage is avascular ! Nutrients and O 2 must diffuse into tissue Surrounded by perichondrium Exceedingly slow to heal, if at all Also, good site for infection
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