MEDICAL
HEART AND PERICARDIUM
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Which of the following is often called the pacemaker of the heart?
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Purkinje fibers
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sinoatrial (SA) node
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atrioventricular (AV) bundle (bundle of His)
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atrioventricular (AV) node
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Explanation:
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 delay in conduction of impulse in this node changes the duration of contraction between the atria and the ventricles. Hence AV node is called as the pace-setter.
Detailed explanation-3: -Single chamber. One lead attaches to the upper or lower heart chamber. Dual-chamber. Uses two leads, one for the upper and one for the lower chamber. Biventricular pacemakers (used in cardiac resynchronization therapy). 11-Dec-2022
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