PHYSIOLOGY
CARDIOVASCULAR PHYSIOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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What primarily causes the 0.16 s delay of impulse from the atrium to the ventricle?
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temporary impulse block
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length of the internodal pathway to the AV node
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limited gap junctions found at the AV node
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none of the above
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Explanation:
Detailed explanation-1: -Disease of the AV node can cause either a delay or a partial or complete block in the transmission of electrical impulses from the atria to the ventricles, a condition known as heart block. A delay in conduction through the AV node is seen on the ECG as an increased PR interval.
Detailed explanation-2: -The signal travels to the AV node (atrioventricular node). This node is between the atria and the ventricles. In the AV node, the impulses are slowed down for a very short time. This allows the atria to contract a fraction of a second before the ventricles.
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