MEDICAL
HEART AND PERICARDIUM
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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The SA Node is known as the natural pacemaker, but it can be altered depending if you are at rest or in motion. If you are out running, the SA Node increases Action Potentials by which nervous system sending hormones to the SA node?
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Parasympathetic
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Sympathetic
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Somatic
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None of the above
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Explanation:
Detailed explanation-1: -If the sinus node is not functioning normally-due to damage from surgery, drugs, congenital heart defects or other causes-the heartbeat may become very slow with a decrease in blood pressure. Sinus node dysfunction may lead to an abnormally slow heart rhythm called bradycardia.
Detailed explanation-2: -The SA node is often referred to as a natural pacemaker because it generates a series of electrical pulses at regular intervals. The pulse is then sent to a group of cells known as the atrioventricular node (AV node). The AV node relays the pulse to the 2 lower chambers of the heart (the ventricles).
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