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 23 - The Urinary System - Study Guide - Testing Your Recall - Page 922: 18

Answer

The answer for #18 is internal urethral

Work Step by Step

The internal urethral sphincter (of smooth muscle) is at the base of the bladder where it joins the urethra. This sphincter which opens and closes the urethral orifice is under automatic nervous system (ANS) control. Sympathetic stimulation opens it, but parasympathetic impulses close it.
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