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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...
The SA node is both controlled and influenced by both the parasympathetic nervous system and the sympathetic nervous system. This control/influence can adjust both the heart rate, and force of contractions. So while the heart beat occurs without conscious effort, it can also be influenced by your surroundings.