In an isometric muscle contraction, the length of the muscle stays the same. The correct option is 2.
What is isometric muscle contraction?
Isometric contractions are one in which the length of the muscle doesn't quite change. There is no joint or limb motion.
Isotonic contractions occur when the muscle length changes, resulting in limb motion. When the muscle shortens, it undergoes a concentric contraction.
Thus, the correct option is 2.
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