PHYSIOLOGY
CARDIOVASCULAR PHYSIOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Which statement below correctly matches the structure with its function?
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Veins carry blood away from the heart
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The atria are the high pressure receiving chambers of the heart
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the sinoatrial node initiates the action potential that causes the heart to beat
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contractile cardiac muscle cells can trigger their own action potentials without neural input
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Explanation:
Detailed explanation-1: -The sinoatrial node is perhaps one of the most important tissues in the entire body: it is the natural pacemaker of the heart, making it responsible for initiating each-and-every normal heartbeat. As such, its activity is heavily controlled, allowing heart rate to rapidly adapt to changes in physiological demand.
Detailed explanation-2: -The heart’s intrinsic pacemaker, the sinoatrial node (SAN), generates spontaneous action potentials (AP) through a system of coupled oscillators whose common output initiates each normal heartbeat.
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