The bowel movement is controlled by___.

Explanation

**Step-by-Step Solution:**

1. **Understanding Bowel Movement**: Bowel movement refers to the process of defecation, where waste is eliminated from the body.

2. **Role of Anal Sphincter**: The anal sphincter is a muscle that plays a crucial role in controlling bowel movements. It consists of two parts: the internal anal sphincter and the external anal sphincter.

3. **Types of Anal Sphincters**:
- **Internal Anal Sphincter**: This sphincter is involuntary, meaning it is controlled automatically by the body without conscious effort.
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