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The result is an increase in the heart rate. Conversely, stimulating the parasympathetic nervous system (vagal nerves to the heart) increases the resting potential and decreases the rate of diastolic depolarization; under these circumstances the heart rate slows. The...
Answer: Since the vagus nerve is parasympathetic is action.  When the nerve is stimulated, the following actions occur at the  myocardium:    1. The heart rate and t â¦ he force of heart contraction slows down.   2. It leads to conronary vasoconstriction.   3. The vagus never innervates the heart and affects the SA node. Otto Loewi discovered that the vagus nerve through the action of Ach (a neurotransmitter) slowed the heart. â¦ So the vagus nerve can slow the action (or beating) of the heart.