PHYSIOLOGY
CARDIOVASCULAR PHYSIOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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What does the AV Node do?
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Causes Ventricles to contract
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Cause right Atria to contract
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Delays passage of impulses to the ventricles
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Directs impulses to the apex of the heart
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Explanation:
Detailed explanation-1: -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. The blood from the atria empties into the ventricles before the ventricles contract.
Detailed explanation-2: -Parasympathetic (vagal) activation decreases conduction velocity (negative dromotropy) at the AV node by decreasing the slope of phase 0 of the action potentials. This leads to slower depolarization of adjacent cells and reduced velocity of conduction.
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