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Muscles contract in different ways to move and stabilize the body. Prime movers or agonists are muscles that cause joints to bend or flex, while antagonists cause joints to straighten or extend and hold positions. Fixators work with agonists to maintain body position for movement, and synergists shorten to aid joint motion along with agonists. Isometric contractions occur when muscle length stays the same against resistance. During concentric contractions muscles shorten to move joints, like in bicep curls, while eccentric contractions lengthen under load, such as when lowering a weight.
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- 1. MUSCLES Join up the following definitions with their key words. Prime movers / Agonists - muscles that cause the joint to bend Antagonists - these muscles hold joints in position Flexors - muscles that cause the joints to straighten Extensors - the muscle which relaxes against the agonist Fixators - these muscles hold the body in position to enable agonists to work Synergists - the muscles that shorten to move the joint Isometric muscle contraction - muscle lengthens - bounding exercises Isotonic concentric contraction - muscle shortens - pushing against a fixed object Isotonic eccentric contraction -no movement occurs - bicep curls