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insertion
mobile attachment point
- when muscle contracts -> generates muscle action (like abduction etc)
agonist-antagonist pairs
muscles work in pairs -since muscles can only contract on own - to regulate movement
agonist
generates specific motion
antagonist
produces opposite motion to agonist
Adduction
- movement toward from midline
ex. elevate lower jaw (close mouth)
Abduction
movement away from the midline of the body
ex. depress jaw, open mouth
flex
reduces angle between two parts of the body
- bicep curl
extend
increase angle between 2 parts of body
- stretch arms out
protraction
movement of part of body forward (away from base) - in anterior direction
retraction
movement of body backward
(posterior direction)
elevate
raising part of the body
Origin of muscle
attachment point more stable and immovable
- work to bring 2 end of muscle closer together
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