muscular system - ms. lynch's lessons€¦ · muscular system part i movement posture &...
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Muscular SystemPart I
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● Movement● Posture & Position● Support● Guards Entrances & Exits● Maintains Body Temperature● Stores Nutrients
Skeletal Muscle Functions
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Layers to a Muscle● Endomysium
○ elastic connective tissue that surrounds each individual fiber
● Perimysium○ collagen & elastic connective tissue surrounding
bundles of fibers● Epimysium
○ collagen fiber around the entire muscle● All three bundle and form tendons
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Muscle Cells
● Myoblasts○ muscle germ cells○ come together to form fibers
■ not all myoblasts will fuse to form a fiber; those that don’t stick around for repair
● Sarcolemma○ plasma membrane of myoblast
● Sarcoplasm○ cytoplasm of myoblast
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Muscle Fiber Components
● Myofilaments○ thick & thin
● Myofibrils● T-tubules● Sarcoplasmic Reticulum● Sarcomeres
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Myofilaments
● protein filaments● thick filaments
○ made of myosin○ stain darker
● thin filaments○ made of actin○ stain lighter
Myofilaments form myofibrils.
Myofibrils form muscle fibers.
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Sarcoplasmic Reticulum
● tubular network surrounding each myofibril● T-tubules are continuous extensions of the
sarcoplasmic reticulum that branch through the muscle fiber
● Both are important for conducting electrical impulses
● Where SR and TT meet is referred to the terminal cisternae
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Sarcomere● repeating functional unit within a
myofilament
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