Rectum

Definition

The rectum is the final section of the large intestine, terminating at the anus. It stores feces before they are excreted from the body.

5 Must Know Facts For Your Next Test

1. The rectum is about 12 centimeters long in adults.
2. It plays a crucial role in controlling defecation through its muscular walls and internal/external sphincters.
3. The rectum receives waste material from the colon and signals when it needs to be expelled.
4. Rectal veins can become swollen and inflamed, leading to conditions like hemorrhoids.
5. The rectum's lining contains sensory nerves that help detect the presence of stool.

Review Questions

• What is the primary function of the rectum in the digestive system?
• How long is the rectum typically in adults?
• What role do sphincters play in the functioning of the rectum?

Related terms

Colon:

The longest part of the large intestine, responsible for water absorption and formation of stool.

Anus: The opening at the end of the digestive tract where feces exit the body.

Hemorrhoids: Swollen veins in or around the anus and lower rectum, often causing discomfort or bleeding.