What is the term used to describe the ability of the autonomic nervous system to control the pace of the SA node through the vagus nerve?

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Vagal tone is the ability of the autonomic nervous system to control the pace of the SA node through the vagus nerve. An ectopic focus is when any part of the conduction system other than the SA node is setting the pace. Any cardiac muscle cell is capable of becoming a pacemaker. A nodal rhythm occurs if the AV node is the ectopic focus. An arrhythmia is an abnormal heart rhythm.

What Is the Term Used to Describe the Ability of the Autonomic