What is the point on which applied muscle action results in motion?

The correct answer is the insertion, which is the point where a muscle attaches to the bone that it moves. When a muscle contracts, it pulls on this insertion point, resulting in movement of the associated joint or limb. The insertion is typically located at the more distal end of the muscle and is where the muscle exerts its force to create motion.

Understanding this concept is crucial because it highlights how the actions of muscles translate into movement. The origin, in contrast, is the fixed attachment point of the muscle on the stationary bone, while the belly refers to the main body of the muscle between the origin and insertion. These anatomical distinctions clarify the mechanics of how muscles function during movement.