MUSCLE PHYSIOLOGY

Detailed explanation-1: -Contractions can be isotonic if the length of the muscle changes while tension remains the same, or isometric if the length of the muscle remains the same. Isotonic contractions can further be divided into eccentric contractions when a muscle lengthens, and concentric contractions when a muscle shortens.

Detailed explanation-2: -Eccentric contraction occurs when the force of contraction is less than the force of resistance. In other words, the force of resistance is greater than that of contraction, resulting in muscle lengthening and an increased distance between muscle origin and insertion.

Detailed explanation-3: -For example, when you are bending your forearm towards your body, your biceps are contracting and bending your arm. Thus, your biceps are the agonist muscle group.