MUSCLE NERVE CARTILAGE BONE
CARDIAC MUSCLE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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increase rate of SA node discharge
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decrease rate of SA node discharge
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decrease excitability of the AV junction fibers
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increase excitability of the AV junction fibers
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Detailed explanation-1: -Typically, vagal stimulation results in sinus node slowing accompanied by slowing of conduction though the AV node.
Detailed explanation-2: -There’s one vagus nerve on each side of your body. The vagus nerve runs from the lower part of the brain through the neck to the chest and stomach. When the vagus nerve is stimulated, electrical impulses travel to areas of the brain. This alters brain activity to treat certain conditions.
Detailed explanation-3: -Vagal stimulation of the parietal cell occurs through M3 cholinergic receptors and via the release of histamine and gastrin from enterochromaffin-like cells and G-cells, respectively.
Detailed explanation-4: -Vagus nerve stimulation (VNS) is known to reduce the heart rate, and hence may be a non-pharmacological alternative for the management of persistent sinus tachycardia. To precisely regulate the heart rate using VNS, closed-loop control strategies are needed.