Essentials of Human Anatomy & Physiology (12th Edition)
Essentials of Human Anatomy & Physiology (12th Edition)
12th Edition
ISBN: 9780134395326
Author: Elaine N. Marieb, Suzanne M. Keller
Publisher: PEARSON
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Chapter 14, Problem 9MC
Summary Introduction

Introduction:

Defecation occurs when the walls of the colon and the rectum contract and the anal sphincters relax.

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Essentials of Human Anatomy & Physiology (12th Edition)

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