The standard medical abbreviation ECG refers to a test used to assess which of the following body systems?

• A. Cardiovascular system
• B. Respiratory system
• C. Digestive system
• D. Nervous system

Answer: (A)

ECG examines the heart’s electrical activity to evaluate the cardiovascular system. By recording the electrical impulses that coordinate the heartbeat, it shows the timing and sequence of atrial and ventricular activity (the P wave, QRS complex, and T wave). This information helps identify rhythm problems, conduction abnormalities, and signs of reduced blood flow to the heart muscle. Since it specifically measures the heart’s electrical function, it focuses on the cardiovascular system. It does not directly assess the lungs (respiratory), digestive tract, or nervous system, which is why those systems aren’t evaluated by an ECG.