Which statement best describes an ECG's use?

Which statement best describes an ECG's use?

• A. It measures blood pressure.
• B. It records the brain waves.
• C. It records the heart's electrical activity.
• D. It records the heart's electrical activity and can print a trace.

Answer: (D)

An ECG’s purpose is to monitor the heart’s electrical activity as it triggers each heartbeat, and this activity is presented as a trace that can be printed or viewed digitally for review and record-keeping. The best description combines both components: it records the heart’s electrical signals and provides a printable trace that clinicians use to assess rhythm, rate, and conduction. The other statements miss key parts: blood pressure is measured with a cuff, brain waves are recorded by an EEG, and simply saying it records electrical activity doesn’t capture the practical trace output that’s essential for interpretation.

An ECG’s purpose is to monitor the heart’s electrical activity as it triggers each heartbeat, and this activity is presented as a trace that can be printed or viewed digitally for review and record-keeping. The best description combines both components: it records the heart’s electrical signals and provides a printable trace that clinicians use to assess rhythm, rate, and conduction. The other statements miss key parts: blood pressure is measured with a cuff, brain waves are recorded by an EEG, and simply saying it records electrical activity doesn’t capture the practical trace output that’s essential for interpretation.