MEDICAL
HEART AND PERICARDIUM
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Sinoatrial (SA) Node
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AV node
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Either A or B
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None of the above
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Detailed explanation-1: -The SA node starts the sequence by causing the atrial muscles to contract. That’s why doctors sometimes call it the anatomical pacemaker. Next, the signal travels to the AV node, through the bundle of HIS, down the bundle branches, and through the Purkinje fibers, causing the ventricles to contract.
Detailed explanation-2: -The sinus node continuously generates electrical impulses, thereby setting the normal rhythm and rate in a healthy heart. Hence, the SA node is referred to as the natural pacemaker of the heart.
Detailed explanation-3: -Step 1: Pacemaker Impulse Generation. The first step of cardiac conduction is impulse generation. Step 2: AV Node Impulse Conduction. Step 3: AV Bundle Impulse Conduction. Step 4: Purkinje Fibers Impulse Conduction. 24-Jun-2019