Answer
Smooth muscles.
Work Step by Step
Primary walls of hollow organs like the urinary bladder is made up of smooth muscles. They also have elongated cells.
Essentials of Human Anatomy & Physiology (12th Edition)
by Marieb, Elaine N.; Hoehn, Katja N.
Published by
Pearson
ISBN 10:
1292216239
ISBN 13:
978-1-29221-623-2
Chapter 6 - The Muscular System - Review Questions - Page 249: 32
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