Biol129_c9 - Muscle Function Muscle is responsible for many functions Skeletal Movement Stability Organ motion Heat production Communication 1

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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 •Ep imy s ium – 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
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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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This note was uploaded on 03/31/2008 for the course BIOL 129 taught by Professor Sachshowardgeor during the Spring '08 term at Pennsylvania State University, University Park.

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Biol129_c9 - Muscle Function Muscle is responsible for many functions Skeletal Movement Stability Organ motion Heat production Communication 1

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