Q: Which layer of the heart records electrical changes in an ECG?

A Epicardium
B Pericardium
C Endocardium
D Myocardium

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Answer: D

Explanation:

An ECG, or electrocardiogram, records the electrical changes in the myocardium layer of the heart. The body fluid contains ions that produce an electric current and cause changes in the myocardium. The other layers of the heart, including the epicardium, pericardium, and endocardium, do not play a role in the electrical activity of the heart that is recorded on an ECG.

Cardiovascular system

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Q: Which layer of the heart records electrical changes in an ECG?

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