digestive track waste expulsion opening

The anus is the opening in the human body that is between the buttocks. It is at the end of the gastrointestinal system (including the organs that digest food), where feces or stool comes out of the body.

Scheme of digestive tract, with anus marked.
File:Female and male anus.jpg
The anus of a female and a male (right).
Anatomical terminology

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