Discussion
The study of muscle action using electrical signals is called:
Answer: B
The study of muscle action through its electrical signals is electromyography.
Electromyography (EMG) records the electrical activity produced by skeletal muscles when they contract, using surface or needle electrodes, and is used to diagnose muscle and nerve disorders (myo-, muscle).
Electrocardiography records the electrical activity of the heart, an X-ray is an imaging technique that shows bones and dense tissue, and a physical check-up is a general clinical examination. None of them measures muscle signals specifically.
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