PATHOLOGY MCQ
HEART
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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What is the final destination of the electrical impulse in the heart?
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Purkinje Fibers
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SA & AV Nodes
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Bundle Branches
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Superior Vena Cava
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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: -The bundle branches then divide into an extensive system of Purkinje fibers that conducts the impulses at high velocity (about 4 m/sec) throughout the ventricles. This results in rapid depolarization of ventricular myocytes throughout both ventricles.
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