HISTOLOGY
BLOOD VESSELS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Damaged SA node
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Damaged AV node
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Damage Bundle of His
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Damaged Perkinje Fibers
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Detailed explanation-1: -The P wave represents the electrical depolarization of the atria. In a healthy person, this originates at the sinoatrial node (SA node) and disperses into both left and right atria.
Detailed explanation-2: -Atrial enlargements can widen the P wave or increase the P wave amplitude. Ectopic atrial rhythms can alter the normal morphology of the P waves. There are many heart rhythms in which the P waves are not able to be identified, including atrial fibrillation and sometimes junctional rhythms.
Detailed explanation-3: -An abnormal P wave may indicate atrial enlargement. Atrial depolarization follows the discharge of the sinus node. Normally depolarization occurs first in the right atrium and then in the left atrium. Atrial enlargement is best observed in the P waves of leads II and V1.