Question

Which of the following statements are TRUE regarding the ECG?

A. The ECG machine amplifies and measures tiny currents generated by the depolarization of myocardial cells.
B. A "lead" is formed by two or more electrodes. Currents flowing toward a lead are displayed as positive deflections on the ECG.
C. The spatial orientation of the leads can help monitor electrical currents generated by different portions of the heart.
D. All of the above are true.

Answer 1

All provided statements about the ECG are true, including the amplification of electrical currents, the composition and functioning of a lead, and the utility of lead orientation in diagnosing heart issues.

Step-by-step explanation:

Regarding the ECG, all of the provided statements are TRUE. Statement A is correct: the ECG machine amplifies and measures the electrical currents generated by the depolarization and repolarization of myocardial cells. Statement B is also true: a "lead" in an ECG context is indeed formed by two or more electrodes and electrical currents flowing toward a lead cause positive deflections on the ECG. Lastly, statement C is accurate as the spatial orientation of the leads aids in monitoring the electrical currents from different parts of the heart, helping to diagnose and locate issues such as infarcts.