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The term that describes the interaction and movement occurring at joints is range of motion. Range of motion refers to the extent of movement available at a specific joint, encompassing all the angles and positions through which that joint can move. It is a critical concept in understanding joint functionality, as it influences overall mobility and the ability to perform physical activities.

While flexibility often relates to the ability of muscles and tendons to stretch, it does not specifically address the movement capabilities of joints. Muscle tone refers to the subtle tension in muscles, which can affect posture and readiness for action but does not directly quantify joint movement. Stability involves the ability of joints to maintain their position and prevent unwanted movements, but it does not inherently describe the range over which movement occurs.

In sum, range of motion is the most accurate term for characterizing the movement dynamics at joints, as it encompasses the total motion achievable in a given direction.