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Lesson 10. The Rectum and Anus
1-10. THE RECTUM AND ANUS The rectum is about 5 inches long and follows the curve of the sacrum and coccyx until it bends back into the short anal canal. The anus is the external opening at the lower end of the digestive system. It is kept closed by a strong sphincter muscle. The rectum receives feces and periodically expels this material through the anus. This elimination of refuse is called defecation. |
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David L. Heiserman, Editor Publisher: SweetHaven Publishing Services |
Copyright © 2006, SweetHaven Publishing Services |