Anatomy & Physiology: The Unity of Form and Function, 7th Edition

Published by McGraw-Hill Education
ISBN 10: 0073403717
ISBN 13: 978-0-07340-371-7

Chapter 15 - The Autonomic Nervous System and Visceral Reflexes - Study Guide - True or False - Page 576: 10

Answer

10. True

Work Step by Step

The two divisions of the autonomic nervous system ( the sympathetic and the parasympathetic) have antagonistic effects on the iris. Sympathetic stimulation of the iris cause pupil dilation; in contrast, parasympathetic stimulation of the iris results in pupil constriction.
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