Sympathetic activation of the AV node and ventricular conduction pathways has what effect on conduction velocity and ERP?

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Multiple Choice

Sympathetic activation of the AV node and ventricular conduction pathways has what effect on conduction velocity and ERP?

Explanation:
Sympathetic activation speeds how quickly impulses travel through the AV node and the ventricular conduction pathways while making tissue ready for the next impulse sooner. Norepinephrine acting on beta-1 receptors raises cAMP and activates PKA, which enhances the depolarizing drive in the conduction system (faster phase 0) and also boosts repolarizing processes. This results in a faster conduction velocity and a shorter effective refractory period. The combination matches increasing conduction speed and decreasing ERP. Slower conduction, longer ERP, or no change would not align with the effects of sympathetic tone on these tissues.

Sympathetic activation speeds how quickly impulses travel through the AV node and the ventricular conduction pathways while making tissue ready for the next impulse sooner. Norepinephrine acting on beta-1 receptors raises cAMP and activates PKA, which enhances the depolarizing drive in the conduction system (faster phase 0) and also boosts repolarizing processes. This results in a faster conduction velocity and a shorter effective refractory period. The combination matches increasing conduction speed and decreasing ERP. Slower conduction, longer ERP, or no change would not align with the effects of sympathetic tone on these tissues.

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