Autonomic Tone

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Autonomic Tone

by autonomic tone?
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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 -if the parasympathetic Vagus nerves to the heart are cut the heart beats as its own intrinsic rate of about 100 beats/minute -sympathetic tone keeps most blood vessels partially constricted and this maintains BP; loss of sympathetic tone can cause such a rapid drop in BP that a person goes into shock

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