PHYSIOLOGY
CARDIOVASCULAR PHYSIOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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The nurse is helping a patient understand why the heart beat can change in speed. When doing so, what should the nurse explain as being the pacemaker of the heart?
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Bundle of His
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Sinoatrial node
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Purkinje’s fibers
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Atrioventricular node
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Explanation:
Detailed explanation-1: -If the sinoatrial node fails, in a normal heart, the atrioventricular node (AV node) should take over the pacemaker function. But the spontaneous rate of the atrioventricular node is lower than that of the sinoatrial node. Hence the heart rate will be lower.
Detailed explanation-2: -The sinoatrial node sends out an electrical impulse that stimulates contraction of the myocardium (heart muscle tissue) This impulse directly causes the atria to contract and stimulates another node at the junction between the atrium and ventricle.
There is 1 question to complete.