| Term 
 | Definition 
 
        | point of attachment, does not move when the muscle contracts |  | 
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        | Term 
 | Definition 
 
        | point of attachment that moves when muscle contracts |  | 
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        | Term 
 | Definition 
 
        | muscle or group of muscles that directly performs a specific movement |  | 
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        | Term 
 | Definition 
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        | Term 
 | Definition 
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        | Term 
 | Definition 
 
        | response to nerve signals |  | 
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        | Term 
 | Definition 
 
        | ability to contract or shorten |  | 
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        | Term 
 | Definition 
 
        | allows muscles to return to their resting length after being contracted |  | 
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        | Term 
 | Definition 
 
        | segment of myofibril between two successive Z lines |  | 
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        | Term 
 | Definition 
 
        | continualy pumps calcium ions from sarcoplasm and stores them within its sacs |  | 
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        | Term 
 | Definition 
 
        | thousands in each myofibril |  | 
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        | Term 
 
        | myosin actin
 tropomyosin
 toponin
 |  | Definition 
 
        | four types of myofilaments |  | 
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        | Term 
 | Definition 
 
        | single,brief threshold stimulus produces a quick jerk of the muscle |  | 
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        | Term 
 | Definition 
 
        | series of stimuli come in rapid enough succession, muscle doesnt have enough time to relax before next stimuli |  | 
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        | Term 
 | Definition 
 
        | tension is not sustained at a comletely constant level |  | 
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        | Term 
 | Definition 
 
        | contraction that tone or tension stay the same |  | 
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        | Term 
 | Definition 
 
        | muscle length remains teh same but muscle increases |  | 
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        | Term 
 | Definition 
 
        | structual and functional center of the entire nervous system |  | 
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        | Term 
 
        | peripheral nervous system |  | Definition 
 
        | nerve tissues that lie in the outer regions of the nervous system |  | 
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        | Term 
 | Definition 
 | 
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        | Term 
 | Definition 
 
        | support functions of neuron |  | 
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        | Term 
 | Definition 
 
        | how many nuerons in the human brain |  | 
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