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Lecture 15

MEDT220 Lecture 15: Chapter 15 – musculoskeletal system

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Medical Laboratory Sciences
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Chapter 15 musculoskeletal system Musculoskeletal System Provides form, support, stability, and movement to the body Bones (osteo) Provide framework on which the body is constructed Protect and support attachment for muscles Ligaments: bind bone to bone Muscles (myo, musculo) Attached to bones or to internal organs and vessels Provide movement Tendons: bind muscle to bone Joints (arthro) Places bones come together Type of joint in a location determined by need for greater or lesser flexibility of movement Bones Complete organs composed of dense, hard connective tissue, rich supply of blood vessels and nerves Osseous (LGk = bony) tissue: connective tissue Osteocytes: bone cells Collagen Intercellular calcium salts Bones of fetus are composed of cartilage More flexible and less dense due to lack of intercellular calcium salts During embryo development, calcium salts are deposited in cartilage Ossification Bone formation Gradual replacement of cartilage and its intercellular substance by immature bone cells and calcium deposits Bone cells Cells: osteo = bone Osteoblast: immature osteocyte produces immature bony tissue that replaces cartilage Osteoclast: clast: Gk = to break Large cells that reabsorb or digest bone Bone phagocytes Digest bone tissue form the inner sides enlarging the inner cavity so bones do not become overly thick and heavy Osteocyte: osteoblast encased in bony matrix Skeletal maintenance
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