Which option best defines a muscle?

• A. Tissue that connects bone to bone
• B. Tissue used for motion, not stability
• C. Bone that supports the body
• D. Nerve that controls movement

Answer: (B)

Muscle tissue is the contractile tissue of the body that shortens to pull on bones across joints, generating movement. That ability to actively shorten and produce force is what defines a muscle: it moves body parts. While muscles do help with stability and posture, their primary role is to enable motion. By contrast, the other options point to different structures: tissue that connects bone to bone describes ligaments, a bone is the rigid framework, and a nerve controls signals for movement. So, motion-focused tissue best matches what a muscle is.