MEDICAL PHYSIOLOGY

Detailed explanation-1: -Contraction will move limbs associated with that joint. In this sense, the bone acts as a lever with the attached muscle fiber’s contraction, driving movement. During flexing of the forearm the biceps brachii is the agonist muscle, pulling the forearm up towards the shoulder.

Detailed explanation-2: -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.