Vagal tone refers to the

A.  decreasing of  the heart rate below its inherent rhythm by parasympathetic stimulation.
B.  decreasing of  the heart rate below its inherent rhythm by sympathetic stimulation.
C.  increasing of  the heart rate above its inherent rhythm by sympathetic stimulation.
D.  increasing of the heart rate above its inherent rhythm by parasympathetic stimulation.


A

Anatomy & Physiology

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