Resting muscles still have some degree of muscle tension produced by involuntary activation of motor units in the brain and spinal cord.This small amount of muscle tension is known as:

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Quizplus · Accepted Answer

Muscle tone refers to the small amount of tension present in resting muscles due to the continuous involuntary activation of motor units in the brain and spinal cord. This can be demonstrated by the fact that even when we are not actively using a muscle, it still feels slightly firm or tense. Recruitment refers to the process of activating additional motor units in a muscle to increase its force of contraction, whereas fused tetanus refers to a sustained contraction in which the muscle fibers do not fully relax between stimuli. Isotonic contraction refers to a type of muscle contraction in which the tension remains constant while the muscle length changes. None of these terms accurately describe the small amount of muscle tension present in resting muscles, which is why muscle tone is the best choice.

Resting Muscles Still Have Some Degree of Muscle Tension Produced