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What is Heart Rate Regulation: Sympathetic vs. Parasympathetic Effects about?

The sympathetic nervous system increases heart rate and conduction velocity through norepinephrine acting on beta receptors, while the parasympathetic system decreases heart rate and conduction velocity through acetylcholine acting on muscarinic receptors. The sympathetic effect enhances contractility in the ventricles, whereas the parasympathetic effect has minimal impact on them. Strong vagal stimulation can lead to severe bradycardia or temporary cardiac arrest.

Author

omaima.6jamal

Language

EN