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 electrical events is most descriptive of a pacemaker cell?
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Spontaneous depolarization
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Myocardial ischemia
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Actin, Myosin
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Contraction, relaxation
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Explanation:
Detailed explanation-1: -Cells within the sinus node have the fastest rate of spontaneous depolarization, and, therefore, the sinus node is the main pacemaker region of the heart.
Detailed explanation-2: -The initiation for a heart beat arises in the pacemaker cells of the sinoatrial (SA) node located in the right atria. From the SA node, the wave of depolarization moves through both atria (P wave), resulting in atrial contraction.
There is 1 question to complete.