MICROANATOMY

Detailed explanation-1: -Example: The flexor muscles or the biceps of the upper arm bends the lower arm over the upper arm (flexes). Extension of the lower arm is caused by the extensor muscles or the triceps. Hence these two muscles are antagonistic or work in the opposite direction.

Detailed explanation-2: -Antagonistic muscle pairs in action The hamstrings are the agonist and the quadriceps are the antagonist. In the contact and recovery phase, the quadriceps contract to extend the knee while the hamstrings lengthen to allow the movement. The quadriceps are the agonist and the hamstrings are now the antagonist.

Detailed explanation-3: -Other Examples Of Agonist & Antagonist Muscle Pairs The deltoids (shoulder) and the latissimus dorsi (upper back) Pectoralis major (chest) and the trapezius (upper back) Tibialis anterior and gastrocnemius (both anterior and posterior calf muscles)

Detailed explanation-4: -The muscle primarily responsible for a movement is called the prime mover, and muscles that assist in this action are called synergists. A synergist that makes the insertion site more stable is called a fixator. Meanwhile, a muscle with the opposite action of the prime mover is called an antagonist.