Final answer:
Slow-twitch and fast-twitch muscle fibers differ in their contraction speed and energy production methods.
Explanation:
The pair of terms that best references types of engaging muscles, one related to movement and the other involving contraction only but no movement, are slow-twitch and fast-twitch muscle fibers. Slow-twitch fibers contract slowly and utilize aerobic respiration for sustained activity, while fast-twitch fibers contract quickly but fatigue rapidly due to anaerobic metabolism.
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