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24 Cards in this Set
- Front
- Back
Epimysium |
Layer of dense irregular connective tissue surrounding entire skeletal muscle |
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Fasicle |
Bundle of muscle fiber cells together |
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Perimysium |
Connective tissue fibers that separate skeletal muscle into fascicles |
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Endomysium |
Surrounds each muscle fiber within a fascicle and binds muscle fibers together |
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Myosatellite Cells |
Muscle stem cells neighboring muscle fibers to repair damaged muscle cells |
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Muscle fibers |
Individual muscle cells with many contractile organelles called myofibrils |
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Myofibrils |
Contractile organelles in muscle fibers made of component parts called sarcomeres |
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M line |
The midline of a sarcomere |
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Z Line |
The shortening line of a sarcomere when it contracts |
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H band |
The interval of space neighboring the m-line and before the A band |
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Motor Unit |
All muscle fibers controlled by one motor neuron |
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Fast fibers |
Large diameter muscles that use anaerobic metabolism that works for precise movements. Ex are muscles in the eyes |
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Slow fibers |
Small diameter muscles that use aerobic metabolism and works slowly like large muscles |
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Intermediate Fibers |
Muscles that are in between fast and slow fiber diameters |
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Parallel Fibers |
Muscle fibers that are running parallel to tendon |
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Convergent Muscles |
Muscles that fan in directions then converge on muscle tendon |
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Pennate muscles |
Muscles that are angled away from tendon, such as unipennate, bipennate, and multipennate |
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Circular Muscles |
Muscles that are circular in structure like orbicularis oris |
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First class levers |
Levers of muscle with the fulcrum in the middle and the resistance and force applied on either side |
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Second class Lever |
Muscle levers with the resistance in between fulcrum and force applied |
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Third class lever |
Muscle lever with the force applied in between fulcrum and resistance |
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Agonist |
Muscle performing primary action |
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Antagonist |
Muscle performing contrary movement to primary agonist |
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Synergist |
Muscle helping agonist perform function |