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Skeletal system/tissues, joints and skeletal muscle (Skeletal…
Skeletal system/tissues, joints and skeletal muscle
Skeletal system/tissues
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major structural components: Bone is comprised of 35% organic material (cells and ECM), 65% inorganic material (Calcium and phosphate). Tendons and ligaments comprised of dense regular connective tissue. Elastic, hyaline and fibrocartilage.
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Types of bone cells
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Osteoclast-created from leukocytes that form one big multinucleated cell. Their function is to destroy bone.
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Joints
fibrous joints
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syndesmosis-joints connect with dense regular connective tissue. Little movement. Example: carpals, tarsals, and distal tibiofibular joint.
sutures-bones joined by very short interconnecting fibers. Imovable joint. Example: sutures on the cranium
cartilaginous joints
synchondrosis-articulation joined by articular (hyaline) cartilage. Example: epiphyseal plate. Imovable joint.
symphysis-located at the pubic symphysis and intervertebral joints. Ends of bones have a layer of articular cartilage and at point of articulation there is a layer of fibrocartilage. Slightly moveable
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Skeletal Muscle
functions-produce movement, open and close passageways, maintain posture and stabilize joints, generate heat.
properties-contractility, excitability,extensibility, elasticity.
connective tissue layers
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perimysium-dense irregular connective tissue that covers each individual fascicle; blood vessels with in.
Endomysium-with in individual muscle fibers. Composed of mostly reticular fibers. Creates space and allows for very small blood vessels to run next to muscle fibers.
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