Rectum

Definition

The rectum is the final section of the large intestine, serving as a temporary storage site for feces before they are expelled through the anus. It plays a crucial role in the excretory process by signaling when defecation is necessary.

5 Must Know Facts For Your Next Test

1. The rectum stretches approximately 12-15 cm in length.
2. It connects to the sigmoid colon and ends at the anal canal.
3. The rectum is lined with a mucous membrane that aids in the smooth passage of feces.
4. Stretch receptors in the rectal walls signal the need to defecate when filled with feces.
5. It has both voluntary and involuntary muscle control, allowing for regulated defecation.

Review Questions

• What role does the rectum play in the digestive system?
• Describe how stretch receptors function within the rectum.
• How does the rectum differ from other parts of the large intestine?

Related terms

Sigmoid Colon: The S-shaped last part of the colon leading into the rectum.

Anal Canal: The terminal part of the digestive tract through which feces are expelled.

Feces: Waste matter discharged from bowels after food digestion and absorption.