A muscle is either contracting (doing work) or relaxing (not under tension). Some muscles do not ever completely relax under normal conditions.
When you tense a muscle, you are tightening it or contracting it. The opposite is to relax.
Each muscle of the neck, such as the sternocleidomastoid, works by contracting and pulling the head in a specific direction. When one side of the muscle contracts, it creates a torque that turns the head toward the opposite shoulder due to the muscle's attachment points. This unilateral contraction results in rotation and lateral flexion of the neck, effectively directing the head away from the contracting muscle. Thus, acting alone, each muscle facilitates the rotation of the head toward the opposite side.
The general opposite of to contract is to expand.In terms of biology, an opening would dilate (widen) as opposed to contracting or narrowing in size.For a muscle, the opposite of contract would be relax.
A contracting economy is one that is on the decline. The opposite of a contracting economy is a growing economy.
Looking form the out side the two bones to which the Muscle is attached moves closer when the muscle is contracting concentrically while they do not when muscle is contracting eccentrically
muscle fibers contracting
relaxing
Contracting
It represents contracting or shortening of a muscle.
Pulling and contracting is how a muscle moves the bones ....
contracting.
Relaxing