What is the anus and its function

The anus is part of the human digestive system which is located at the end of the rectum. This is a small hole that functions as a channel for unneeded waste or waste from the body, such as feces or feces.

Some important points about the anus are:

What’s that

The anus is a part of the body located at the end of the vessels (intestinum) in the body of animals, including humans. The main function of the anus is to produce gas and carry out a person’s elimination (excreation) from the body through the process of defecation.


The anus is located in the lower part of the body, between the pelvic area and the buttocks. It connects the rectum, which is the last part of the digestive tract, with the external environment.


The anus functions as an exit for feces or feces produced by the digestive system. After food is digested and nutrients absorbed by the intestines, waste that is not digested or absorbed will be collected in the rectum. When the rectum is completely filled, nerve impulses trigger an emptying reflex that causes the anal muscles to tighten and open, allowing feces to be expelled from the body through the anus.

Apart from that, the anus also has a function as a drainage hole for urine and dry waste (urine) in the body. The anus is located at the end of the vessels, where unused contents have absorbed nutrients and water from food. Accidents or changes in the anus can cause health problems, such as hemorrhoids (various veins), fissures (sores), and fistulae (formation of holes between cells).


The anus consists of muscles that can be controlled voluntarily, called sphincters. There are two types of sphincters in the anus, namely the inner sphincter and the outer sphincter. The internal sphincter is a smooth muscle that functions to hold stool in the rectum, while the external sphincter is a skeletal muscle that can be controlled consciously and is used to control emptying.


It is important to keep the anus clean by cleaning it after defecating. This can be done using water and mild soap or wet wipes. It is also important to maintain anal health by eating healthy foods, drinking enough water, and maintaining regular bowel habits.

The anus is an important part of the human digestive system that allows the elimination of body waste. Understanding the anatomy and function of the anus is important for maintaining overall health and cleanliness of the body.

FAQs about the Anus

What is the anus?

The anus is an opening at the end of the digestive tract through which solid waste materials, known as feces or stool, are eliminated from the body. It is the final part of the gastrointestinal system and is located at the end of the rectum.

What is the function of the anus?

The primary function of the anus is to serve as an exit point for waste materials that have been processed and digested by the body. When stool reaches the rectum, it triggers the urge to defecate. The muscles surrounding the anus, called the anal sphincters, relax to allow the expulsion of feces from the body during a bowel movement.

What is the structure of the anus?

The anus is a muscular opening located at the end of the gastrointestinal tract. It consists of two main parts:

  • 1. External anal sphincter: This is a voluntary muscle that surrounds the opening of the anus. It is under conscious control and can be contracted to delay or control the release of stool.
  • 2. Internal anal sphincter: This is an involuntary muscle located deeper within the anus. It remains contracted most of the time to maintain continence, and its relaxation allows for the passage of stool during bowel movements.

What disorders or conditions can affect the anus?

Several disorders or conditions can affect the anus, including:

  • Hemorrhoids: These are swollen blood vessels in the anus or lower rectum, often caused by increased pressure during bowel movements.
  • Anal fissures: These are small tears in the lining of the anus, usually caused by passing hard or large stools.
  • Anal abscesses: These are painful, pus-filled infections that can develop near the anus or rectum.
  • Anal fistulas: These are abnormal connections or tunnels that form between the anal canal and surrounding tissues, usually as a result of an abscess.
  • Anal cancer: This is a rare form of cancer that can develop in the anus, often associated with human papillomavirus (HPV) infection.

How can anal health be maintained?

To maintain anal health, it is important to:

  • Practice good hygiene: Keep the anal area clean by gently washing with warm water after bowel movements. Avoid using harsh soaps or wipes that may irritate the skin.
  • Eat a balanced diet: Consume a diet rich in fiber to promote regular bowel movements and avoid constipation.
  • Stay hydrated: Drink an adequate amount of water to maintain soft stools and prevent dehydration.
  • Exercise regularly: Engage in physical activity to promote healthy digestion and bowel movements.
  • Avoid straining: Avoid straining during bowel movements, as it can lead to the development of hemorrhoids or anal fissures.

If you experience any persistent or concerning symptoms related to the anus, it is recommended to consult a healthcare professional for diagnosis and appropriate treatment.

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