ANATOMY
LIMB VASCULATURE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Which pairing is correct?
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Parasympathetic; endings concentrate in SA, AV nodes and atria/ventricle muscles
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Sympathetic; endings concentrate in SA, AV nodes and atria/ventricle muscles
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Parasympathetic; endings concentrate in atria, SA, AV nodes
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Sympathetic; endings concentrate in atria, SA, AV nodes
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Explanation:
Detailed explanation-1: -Negative dromotropic effect (decrease conduction velocity): Stimulation of the parasympathetic system serves to inhibit AV node conduction velocity.
Detailed explanation-2: -The SA node is supraventricular and is sensitive to parasympathetic and sympathetic influence. The atrioventricular node (AV) and the Bundle of His/Purkinje fibers are two additional groups of specialized pacemaker cardiomyocytes, they have the second and third fastest automaticity rates respectively.
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