Anus
Definition
The anus is the terminal end of the digestive tract, where feces are expelled from the body. It is controlled by two sets of muscles: the internal and external anal sphincters.
5 Must Know Facts For Your Next Test
- The anus is the final part of the large intestine.
- The internal anal sphincter is involuntary, whereas the external anal sphincter is voluntary.
- Defecation involves a reflex that relaxes the internal anal sphincter and contracts the external anal sphincter.
- Hemorrhoids can occur when veins around the anus swell or become inflamed.
- Proper functioning of both anal sphincters is crucial for maintaining continence.
Review Questions
- What are the two types of muscles that control the anus?
- How do the internal and external anal sphincters differ in terms of control?
- What condition commonly affects veins around the anus?
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Subjects (3)
Related terms
Rectum: The final section of the large intestine, leading to the anus.
Sphincter: A circular muscle that constricts a passage or closes a natural opening in the body.
Defecation: The process of expelling feces from the rectum through the anus.
