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A flexor is a muscle that causes a joint to bend. In contrast, an extension is a muscle that straightens a joint.
To extend a muscle A MOTION IS MADE TO INCREASE AN ANGLE BETWEEN TWO BONES.
extends leg; straightens knee joint
An extensor straightens part of your body.
They're referring to opposite motions, if a muscle bends a joint - it's antagonist straightens it out.
A muscle that straightens a joint is called an extensor.Extensors are the muscles whose contraction extends or straightens a limb or other part of the body.Extensor muscle
a big one
Extender
Extensor
Flexor
bicept
Flexor