A person suffered from heart attack that damaged the walls between the 2 ventricles. Which of the following is the most likely affected? (correct answer + 1, wrong answer - 0.25)

AV node

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Bundle of His

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SA node

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None of the above

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Solution

The correct option is B Bundle of His
The electrical impulses begin at sinoatrial (SA) node which is located near the top of right atrium. It continues down to atrioventricular (AV) node. This AV node is located between 2 AV valves.

The bundle of His is present within the wall between the ventricles. Hence, it is the most likely to be affected if the walls between the ventricles undergo damage during a heart attack.

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