Life: The Science of Biology 11th Edition

Published by W. H. Freeman
ISBN 10: 1-31901-016-4
ISBN 13: 978-1-31901-016-4

Chapter 46 - The Mammalian Nervous System: Structure and Higher Functions - 46.2 - Nervous system Functions Rely on Neural Circuits - 46.2 Recap - Learning Outcomes - Page 994: 1

Answer

The sympathetic and parasympathetic divisions of the autonomic nervous system work in opposition to one another to increase and decrease nervous system activity. For example, the sympathetic division raises the heart rate and blood pressure when the fight-or-flight response is triggered, but the parasympathetic system slows the heart rate and lowers the blood pressure.

Work Step by Step

The sympathetic and parasympathetic divisions of the autonomic nervous system work in opposition to one another to increase and decrease nervous system activity. For example, the sympathetic division raises the heart rate and blood pressure when the fight-or-flight response is triggered, but the parasympathetic system slows the heart rate and lowers the blood pressure.
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