14 bone physiology - Skeletal System Bones and Bone Tissue...

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Skeletal System: Bones and Bone Tissue
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Skeletal System Functions 1. Support . Bone is hard and rigid Cartilage is flexible yet strong. Ligaments - bone to bone 2. Protection . Skull around brain; ribs, sternum, vertebrae protect organs of thoracic cavity 3. Movement . Produced by muscles on bones, via tendons. 4. Storage . Ca and P . Stored then released as needed. Fat stored in marrow cavities 5. Blood cell production . Bone marrow that gives rise to blood cells and platelets
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Cartilage Firm, smooth, resilient, non-vascular connective tissue 80% water, protein + ground substance Hyaline, Elastic and Fibro cartilage During development, repair – bone develops from cartilage
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Cartilage 1 main cell type: chondrocyte Located in a cavity (lacuna) Immature chondrocyte = chondroblast Chondroblasts produce matrix (collagen, proteoglycans) Perichondrium – double layer of CT that covers most cartilage – nerve and blood supply Articular cartilage – no preichondrium Appositional growth Interstitial growth
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Long Bone Structure Diaphysis (shaft) Compact bone Epiphysis (end of the bone) Cancellous bone Epiphyseal plate (growth plate) Hyaline cartilage - present until growth stops Articular cartilage Epiphyseal plates Secondary epiphysis Diaphysis Cancellous bone Compact bone Medullary cavity (contains red marrow) Periosteum Endosteum Young bone
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14 bone physiology - Skeletal System Bones and Bone Tissue...

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