PATHOLOGY MCQ
HEART
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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First part of Cardiac Conduction System:This *PACEMAKER* sends action potentials to both atria causing them to contract.
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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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Explanation:
Detailed explanation-1: -The sinus node is sometimes called the heart’s “natural pacemaker.” Each time the sinus node generates a new electrical impulse; that impulse spreads out through the heart’s upper chambers, called the right atrium and the left atrium (figure 2).
Detailed explanation-2: -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
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