Autonomic Nervous System - Parasympathetic Nervous System

3 important questions on Autonomic Nervous System - Parasympathetic Nervous System

What are the effects of PNS stimulation

The vagus nerve decreases HR (negative chronotropic) and causes decreased in force of contraction (negative inotropic)

What happens with strong vagal tone?

Impulses generated at SA node can be stopped, AV and purkinje can take over (ventricular escape)

What is the mechanism of PNS stimulation?

Acetylcholine acts through muscarinic receptors to increase potassium permeability. Efflux of potassium hyperpolarizes cells

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