The muscle that stretches in response to the contraction of the agonist's muscle is called the antagonist's muscle.
When two muscles are antagonistic, one contracts while the other relaxes or lengthens. The muscle that is lengthening or relaxing is referred to as the antagonist, while the muscle that is contracting is referred to as the agonist.
An antagonist is a muscle that works in the opposite direction from the prime mover. In order for muscles to function properly, they must perform two crucial tasks: (1) maintaining body or limb position, such as holding an arm out or standing straight; and (2) controlling rapid movement, such as shadow boxing without connecting with a punch or the ability to restrain the motion of a limb.
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