Biology / Bio 3127 · Atom · ~20 seconds
Antagonistic Muscle Pairs Produce Both Directions of Movement
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Muscles arrange in antagonistic pairs, where one muscle's contraction, per Bio 3115, moves a joint one way while its partner's contraction moves it back, producing apparent push and pull.
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Biceps contraction flexes the elbow; triceps contraction on the opposite side extends it again.
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"Muscles only pull," per Bio 3125, ignores that opposing pairs generate a joint's full range of motion.
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