MEDICAL
HEART AND PERICARDIUM
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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AV node
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bundle fibers
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SA node
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aorta
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Detailed explanation-1: -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-2: -The sinoatrial node (SAN) is the dominant pacemaker of the heart, located at the junction of the superior vena cava and right atria, that regulates heart beat frequency [1].
Detailed explanation-3: -The sinoatrial nodal artery is a branch of the main coronary arteries, or its derivatives, which supplies blood to the pacemaker of the heart, the sinoatrial node.
Detailed explanation-4: -The SA node is normally the dominant, driving pacemaker because it has the highest intrinsic rate of spontaneous automaticity.