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ECG records electrical changes in which of the following layers of the heart, mark the correct option.

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ECG records electrical changes in which of the following layers of the heart, mark the correct option.

(a) Epicardium

(b) Pericardium

(c) Endocardium

(d) Myocardium

This question was posed to me during an internship interview.

I need to ask this question from Cardiovascular System in chapter Human Physiology of Life Sciences

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The correct answer is (d) Myocardium

To explain I would say: ECG is an electrocardiogram, which records electrical changes in the myocardium layer of the heart. Body fluid contains ions that produce electric current and causes changes in the myocardium.

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