6 -BONES - BONES FACT THERE ARE 206 BONES IN THE BODY...

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BONES FACT: THERE ARE 206 BONES IN THE BODY
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FUNCTION OF THE BONES Support – gives structure to the body Protection – protects internal organs from injury Movement – for skeletal muscle movement Mineral homeostasis – Calcium and phosphorus deposits Blood cell production – RBC’s (erythrocytes) produced in bone Triglyceride storage – fats cells stored in bone for energy
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STRUCTURE OF THE BONE Diaphysis – bone shaft or body Epiphysis – distal and proximal end of the bones Metaphysis- regions of mature bone where epiphysis and diaphysis meet
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Figure 6.3a
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BONE Epiphyseal plate- a layer of hyaline cartilage inside metaphysis Epiphyseal line – cartilage in epiphyseal plate is replaced by bone
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Figure 6.3a
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STRUCTURE OF BONE Articular cartilage- thin layer of hyaline cartilage covering epiphysis where bones articulate Periosteum – connective tissue that surrounds bone surface Medullary/marrow cavity- space within diaphysis that contains fatty yellow bone in adult Endosteum – connective tissue that lines the inside of the medullary cavity
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Figure 6.3
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CLASSIFICATION OF BONES bones classified by their shape long - longer than wider (femur) short – cube-like, wider than they are longer ( patella) flat - flattened with slight curve (sternum) irregular - complicated shapes (vertebrae)
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Figure 6.2
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BONE HISTOLOGY Osteogenic cells - bones that undergo mitosis Osteoblasts- bone building cells (alkaline phosphatase - help with Ca deposit & mineralization) Osteocytes - mature bone cells Osteoclasts - bone breaking cells
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This note was uploaded on 06/29/2009 for the course PHYSIOLOGY 001 taught by Professor Kelly during the Summer '09 term at East Los Angeles College.

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6 -BONES - BONES FACT THERE ARE 206 BONES IN THE BODY...

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