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A&P CH 9 Muscles
| Question | Answer |
|---|---|
| Agonist | a muscle that causes or controls joint motion through a specified plane of motion; aka prive mover |
| All or None Response | the property of a muscle fiber contraction by which when contraction is initiated the fiber contracts to its full ability or does not contract at all |
| Antagonist | a muscle usually located on the opposite side of a joint form the agonist and having the opposite action |
| Aponeurosis | a broad flat sheet of fibrous connective tissue |
| Concentric Action | a contraction in which the muscle shortnes with tone because its contractile force is greater than the opposing force at the attachments of the muscle |
| Contractility | the ability of a muscle to shorten forcibly with adequate stimulation |
| Deep Fascia | a coarse sheet of fibrous connective tissue that binds muscles into functional groups and forms partitions called intermuscular septa between muscle groups |
| Dynamic Force | force applied to an object that produces movement in or of the object |
| Eccentric Action | a contraction in which the muscle lengthens with tone because its contractile force is less than the opposing force at the attachments of the muscle |
| Elasticity | the ability of a muscle to recoil and resume its original resting lenght after being stretched |
| Excitability | the ability of a muscle to receive and respond to a stimulus |
| Extensibility | the ability of a muscle to be stretched or extended |
| Fascia | a fibrous or loose type of connective tissue, a fibrous membrane covering |
| Fixator | a stabilizing muscle lcoated at a joint or body part that contracts to fix or stabilize the area |
| Insertion | the attachment of a muscle that moves when the muscle contracts, usually the distal attchment |
| Isometric Action | a contraction in which the muscle stays the same lenght with tone because its contractile force equals that of the opposing forace at the attachments of the muscle |
| Isotonic Action | the action of the muscle that occurs whent ension develops in the muscle with it shortens or lengthens |
| Maximal Stimulus | the point at which all motor units of a muscle have been recruited and the muscle is unable to increase in strength |
| Motor Unit | a motor neuron and all of the muscle fibers it controls |
| Origin | the attachment of a muscle that does not move when the muscle contracts, usually the proximal attachment |
| Oxygen Debt | the extra amount of oxygen that must be taken in to remove the buildup of lactic acid from anaerobic respiration of glucose |
| Resting Tone | the state of tension in resting muscles |
| Reverse Action | When a muscle contracts and the attachment that normally stays fixed moves and the attachment that usually moves stays fixed |
| Static Force | force applied to an object in such a way that it does not produce movement |
| Synergist | a muscle that helps the action occur |
| Threshold Stimuls | the stimulus at whicht he first observable muscle contraction occurs |
| Trigger Points | a hyperirritable locus within a taut band or skeletal muscle, located in the muscular tissue or its associated fascia |
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