Discussion
The working principle of an ECG is based on
Answer: B
The ECG is based on the electrical activity of the heart.
As the action potential spreads from the SA node through the atria, the AV node and the ventricles, the depolarising and repolarising heart muscle creates currents that spread through the body. Electrodes on the skin pick up the resulting potential differences, a few millivolts at most, and record them as the P wave, the QRS complex and the T wave.
Blood pressure changes are recorded by pressure transducers, mechanical contraction by methods such as echocardiography, and blood flow in arteries by Doppler ultrasound. The ECG records none of these.
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