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Biol129_c9 - Muscle Function Muscle is responsible for many...

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1 Muscle Function Muscle is responsible for many functions – Skeletal Movement – Stability – Organ motion – Heat production – Communication
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2 Muscle Connective Tissue • Endomysium – An areolar ct that contains muscle fibers • Fascicles – Groups of muscle fibers (macroscopic) • Perimysium – Ct covering fascicles • Epimysium – Covers the entire muscle Muscle Attachment Muscles must attach to something Two types of attachment Direct or Fleshy attachment Collagen fibers in epimysium connect to periosteum Indirect attachment Collagen fibers in epimysium form tendons • Aponeurosis A special sheet-like tendon attachment
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3 General Anatomy Muscles have: – A stationary origin , a belly and a movable insertion There are 5 types (shapes) of muscle – Fusiform, Parallel, Convergent, Pennate (feather-shaped) and Circular – Pennate can be uni-, bi-, or multi- Muscle Actions Muscles can be: Agonist / Antagonist – promotes, opposes an action Synergist – acts in conjunction with Fixator – acts to keep a bone in place that would otherwise move due to action Extensor / Flexor – perform said actions
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