Flexors and Extensors

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Flexors & Extensors
LifeART Collection Images Copyright © 1989-2001 by Lippincott Williams & Wilkins, Baltimore, MD
The type of muscle that has the opposite effect is the extensor muscle, which opens a joint, increasing the angle between components of a limb, like extending the arm. Similar actions are called extension.
The biceps and triceps are an example of an antagonistic pair of muscles. Antagonistic pairs are responsible for the movement of the entire skeleton.
Muscle fibers consist of myofibrils, mitochondria, an extensive endoplasmic reticulum, and many nuclei.
A flexor muscle is a skeletal muscle whose contraction bends a joint, decreasing the angle between components of a limb, such as straightening the wrist. This action is known as flexion.

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