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Muscle tone is the continuous resistance a muscle has to being stretched or moved. When a muscle is limp or lacks tone, it is described as flaccid. This term specifically denotes decreased or absent muscle tone, which can occur with nerve injury, spinal cord damage, or certain neuromuscular conditions. Flushed describes reddened skin, fatigue means tiredness, and hydration relates to fluid balance in the body; none of these convey the idea of reduced muscle tone the way flaccid does.