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11 Cards in this Set
- Front
- Back
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First-class lever
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When the fulcrum lies between the pull and the load; not abundant in human body
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Second-class lever
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Load lies between the fulcrum and the joint at which the pull is exerted; presence of this type in human body is controversial
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Third-class lever
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Pull is exerted between the fulcrum and load; most abundant in human body
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Origin
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Point of attachment that does not move when the muscle contracts
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Insertion
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Point of attachment that moves when the muscle contracts
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Prime mover
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A muscle that directly performs a specific movement
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Agonists
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Any "mover" muscle that directly performs a movement, including the prime mover
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Antagonists
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Muscles that, when contracting, directly oppose prime movers; relax while prime mover is contracting to produce a more controlled movement
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Synergists
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Muscles that contract at the same time as prime movers; facilitate prime mover actions to produce a more efficient movement
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Fixator muscles
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Joint stabalizers (type of synergists)
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Good posture
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Body alignment that most favors function; achieved by keeping the body's center of gravity over it's base, requires the least muscular work to maintain
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