The muscle with the predominant role in the action of a muscle is called the

What is the prime mover

The prime mover, sometimes called the agonist, is the muscle that provides the primary force driving the action. An antagonist muscle is in opposition to a prime mover in that it provides some resistance and/or reverses a given movement.

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the ileocecal valve (also called bauhin valve), which limits the rate of food passage into the cecum and may prevent material from returning to the small intestine.

auricle

explanation:

the flaps on the front of the atria are called the auricle.