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A flexor is when a bone and a joint are attached by a flexible joint. It is a flexor if the center of the bones that are connected are brought closer when the muscle contracts. The movement that is being made is called a flexion.
A muscle is an extensor if the bones move away from each other when the muscle contracts.
The interaction of flexors and extensors.
Examples: Wrists: controls supination and pronation, Hamstring/ Quadriceps, controls straightening and bending your leg,
Bicep/ Triceps and controls bending your arm,Ankles and controls bending your foot,