BLOOD CARDIOVASCULAR SYSTEM LYMPHOID ORGANS
CARDIOVASCULAR SYSTEM
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Question
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When an electrical impulse reaches the AV node, it is slowed for a brief period of time so that:
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blood can pass from the atria to the ventricles.
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blood returning from the body can fill theatria.
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the impulse canspread through the Purkinje fibers.
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the SA node can reset and generate anotherimpulse.
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Explanation:
Detailed explanation-1: -The electrical impulse travels from the sinus node to the atrioventricular node (also called AV node). There, impulses are slowed down for a very short period, then continue down the conduction pathway via the bundle of His into the ventricles.
Detailed explanation-2: -Atrioventricular node The delay ensures that your atria are empty of blood before the contraction stops. The atria are the heart’s upper chambers. They receive blood from your body and empty it into the ventricles.
Detailed explanation-3: -The delaying an electric impulse through the atrioventricular node (AV node) allows atria to completely empty themselves into the ventricle for contraction before the blood pumps out through ventricles.
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