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Question

The portion of electrocardiogram related to the propagation of the cardiac impulse between the SA node and the AV node is the ......... interval

A
QT
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B
PR
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C
ST
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D
RR
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Solution

The correct option is B PR
A critical delay in the conduction system is performed by the AV node. Without this delay, the atria and ventricles would contract at the same time, and blood wouldn't flow effectively from the atria to the ventricles. The delay in the AV node forms much of the PR segment on the ECG. As the electrical activity is spreading throughout the atria, it travels via specialized pathways, known as internodal tracts, from the SA node to the AV node.

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