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Skeletal Muscle
striated (stripes, like a zebra), many nuclei, contract voluntarily, typically attached to skeleton
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Smooth Muscle
non-striated (smooth), contract involuntarily, found in walls of internal organs
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Cardiac Muscle
found in heart only, striated, tubular, branched, one nucleus, contract involuntarily, found in walls of heart
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Muscle contraction causes movement of
bones at a joint
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Muscles come in pairs because
every action of one muscle has another muscle with the opposite action (antagonistic pair)
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Hierarchy of muscle structure
Muscle -> muscle fibre bundle -> muscle fibre -> myofibrils -> myofilaments
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Myofilaments
a long polypeptide, made of amino acids
smallest functional unit of muscle ( can contract, relax )
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Why does connective tissue wrap around muscle bundles?
prevent friction
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Tendon
tough bit of tissue, made of collagen
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Nerves
control, trigger muscle contractions
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Sarcolemma
cell membrane of muscles: regulate what enters, what leaves
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Myoglobin
muscle tissue that can bind to oxygen
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Sarcoplasm
cytoplasm, contains myoglobin, glycogen
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Sarcoplasmic Reticulum
stores calcium ions needed for muscle contractions
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