APPLIED RADIOLOGICAL ANATOMY

Detailed explanation-1: -The muscle that is contracting is called the agonist and the muscle that is relaxing or lengthening is called the antagonist. One way to remember which muscle is the agonist – it’s the one that’s in ‘agony’ when you are doing the movement as it is the one that is doing all the work.

Detailed explanation-2: -Muscles transfer force to bones through tendons. They move our bones and associated body parts by pulling on them – this process is called muscle contraction. However, muscle contraction cannot act to push the bone back into its original position, and because of this, muscles work in ‘antagonistic muscle pairs’.

Detailed explanation-3: -Answer and Explanation: All skeletal muscles can only pull attached bones; therefore, all muscles must be part of an antagonistic pair. Muscle contraction causes the attached bone to be pulled in its direction. Contraction, however, does not push bones in the opposite direction.

Detailed explanation-4: -Agonist muscles are those we typically associate with movement itself, and are thus sometimes referred to as prime movers. Agonist muscles produce the primary movement or series of movements through their own contractions.