PHYSIOLOGY
CARDIOVASCULAR PHYSIOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Which of the following is FALSE about pacemaker cells?
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They allow the heart to beat on its own
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They create their own electrical impulses
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They are part of the sinoatrial node and the atrioventricular node
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They require depolarizing stimulation from the brain
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Explanation:
Detailed explanation-1: -Automaticity: unlike other cardiomyocytes, pacemaker cells do not require external stimulation to initiate their action potential; they are capable of self-initiated depolarization in a rhythmic fashion.
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: -The sinus node is the heart’s natural pacemaker. It’s a small mass of specialized cells in the top of the right atrium (upper chamber of the heart). It produces the electrical impulses that cause your heart to beat.
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