Final answer:
Muscle movement is captured by electrodes attached to the skin, which measure electrical signals produced by muscles during activity.
Step-by-step explanation:
Muscle movement is captured by electrodes attached to the skin. Electrodes are devices that can detect electrical activity generated by muscles during contraction and relaxation. When muscles activate, they produce electrical signals that electrodes can measure and record. This process is known as electromyography (EMG), which is often used in medical assessments, physical therapy, and sports science to analyze muscle function and movement patterns.