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Parasympathetic tone synonyms, Parasympathetic tone pronunciation, Parasympathetic tone translation, English dictionary definition of Parasympathetic tone. n. The part of the autonomic nervous system originating in the brainstem and the lower part of the spinal cord that, in general, inhibits or opposes the...


parasympathetic nervous system part of the autonomic nervous system, the preganglionic fibers of which leave the central nervous system with cranial nerves III, VII, IX, and X and the first three sacral nerves; postganglionic fibers are distributed to the heart, smooth muscles, and glands of the head and neck, and thoracic, abdominal, and pelvic viscera ...

www.merriam-webster.com/dictionary/parasympathetic nervous system

Parasympathetic nervous system definition is - the part of the autonomic nervous system that contains chiefly cholinergic fibers, that tends to induce secretion, to increase the tone and contractility of smooth muscle, and to slow heart rate, and that consists of a cranial and a sacral part.


Vagal tone refers to activity of the vagus nerve, the 10th cranial nerve and a fundamental component of the parasympathetic branch of the autonomic nervous system. This branch of the nervous system is not under conscious control and is largely responsible for the regulation of several body compartments at rest.


autonomic tone is the background rate of activity of the ANS-it is the balance between the sympathetic and parasympathetic tone-parasympathetic tone maintains smooth muscle tone in the intestines and holds resting heart rate down to about 70-80 beats/minute


What Happens When You Increase Parasympathetic Tone? Increasing stimulation of the parasympathetic nervous system decreases heart rate and blood pressure as well as the size of the pupil. At the same time, it increases digestion, urination, defecation and sexual arousal.


Finally, the researchers noted that IBMT subjects had more high-frequency heart-rate variability than their relaxation counterparts, indicating "successful inhibition of sympathetic tone and activation of parasympathetic tone (in the autonomic nervous system).


The main mechanism by which the parasympathetic nervous system acts on vascular and cardiac control is the so called respiratory sinus arrhythmia (RSA). RSA is described as the physiological and rhythmical fluctuation of heart rate at the respiration frequency, characterized by heart rate increase during inspiration and decrease during expiration.


Parasympathetic definition, pertaining to that part of the autonomic nervous system consisting of nerves and ganglia that arise from the cranial and sacral regions and function in opposition to the sympathetic system, as in inhibiting heartbeat or contracting the pupil of the eye. See more.

www.merriam-webster.com/dictionary/sympathetic nervous system

Sympathetic nervous system definition is - the part of the autonomic nervous system that contains chiefly adrenergic fibers and tends to depress secretion, decrease the tone and contractility of smooth muscle, and increase heart rate.