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A bowel movement is the actions of the terminal colon and rectum that help to push the stool out when you defecate. It consists of four steps:

- First there are constrictions of the colon that push stool down to the terminal colon and rectum.

- Then constrictions around the stool elevates the pressure so that you feel an urge to defecate.

- The sphincter muscles around your anus will relax to ease the defecation.

- Then there are constrictions that make the feces go out.

The bovel movement is primarily an automatic action.

The movement of the stool can however be blocked for some time with voluntary contraction of the anal spincter muscles.

When you defecate you will also typically use your abdominal muscles to make pressure and thus aid the defecation process. This is partly a voluntarily controlled action and is not a part of the bowel movement as such.

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12y ago

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