What is the external opening of the anal canal called?

The external opening of the anal canal is known as the anus. This structure serves as the terminal point of the digestive tract, allowing for the expulsion of feces from the body. The anus is surrounded by muscles that help control the release of waste, making it a crucial component of the excretory system.

Understanding this term is important in the context of human anatomy and physiology, as it relates to various bodily functions and health discussions, including topics such as bowel health and conditions affecting the digestive system. The other terms listed refer to different parts of the digestive or reproductive systems: the rectum is the section of the gastrointestinal tract that leads to the anus, the colon is part of the large intestine, and the vagina is a part of the female reproductive system.