Muscular Sys. Lesson 1
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| Isometric Contraction | Muscle contraction without joint movement
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| Reversal of muscle action | The origin of the contacting muscle moves toward the insertion
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| Isokinetic Contraction | Constant speed with variable resistance / Constant tension of a muscle
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| Assisting mover/ Synergist | Not as powerful as the prime mover/ A muscle that works with one or more other muscles to enhance a particular motion
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| Tone | Slight tension is a muscle
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| Normal Resting Length | Position when muscle is unstimulated
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| Irritability | Ability to receive and respond to a stimulus
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| Contractility | Ability to produce tension
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| Extensibility | Ability to be stretched beyond normal resting length
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| Elasticity | Ability to return to normal length
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| Lengthening contraction is an ex. of | Eccentric Contraction
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| Shortening contraction is an ex. of | Concentric Contraction
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| Insertion moves towards origin is an ex. of | Concentric Contraction
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| Insertion moves away from origin is an ex. of | Eccentric Contraction
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| Muscle contraction moves the body segment against gravity is an ex. of | Concentric contraction
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| Muscle contraction slows the pull of gravity on the body | Eccentric contraction
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| Prime mover/ Agonist | the muscle or muscle group that causes the motion
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| Synergist/Assisting mover | a muscle that works with one or more other muscles to enhance a particular motion
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| Antagonist | the muscle that performs the opposite motion of the agonist
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| Cocontraction | When the antagonist contracts at the same time as the agonist (similar to isometric contraction)
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| Concentric | a muscle contracts and shortens
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| Eccentric | a muscle lengthens as it maintains tension
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| Muscles pull _______________ their origin | toward
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| Closed kinetic chain | requires that the distal segment is fixed (closed) and the proximal segmen(s) moves / weight - bearing
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| Open kinetic chain | the distal segments are free to move while the proximal segments remain stationary
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| Origin | Bony attachment site that is relatively stationary/ beginning
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| Insertion | Bony attachment site that is relatively mobile/ end
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| With a few exceptions, all skeletal muscles cross at least... | one joint
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| Typically, the bulk of a skeletal muscle lies proximal to ... | the joint crossed
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| All skeletal muscles have at least ___________ attachments | two
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| Skeletal muscles can only ________ they never ___________ | Pull... push
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| During contraction, skeletal muscles _________ moves towards the ______________ | insertion... origin
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| Active insufficiency | when a muscle cannot contract any further
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| Passive insufficiency | when a muscle cannot be elongated any further
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| Muscle fibers in either _____________ or _____________ pattern which favors range or power respectively | Parallel... Oblique
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| Muscle tissue has the properties of... | irritablity, contractility, extensibility, and elasticity
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| Muscle contraction types are... | isometric, concentric, eccentric
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| The role of a muscle depends on the situation. The four roles are... | agonist, antagonist, stabilizer, or neutralizer
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| Kinetic chain movement depends on whether the distal segment is ... | fixed or free to move (closed or open)
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Created by:
AdrienneBronner
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