What is the muscular opening at the end of the rectum?

What is the muscular opening at the end of the rectum?

• A. Anus
• B. Pylorus
• C. Esophagus
• D. Ileocecal valve

Answer: (A)

The muscular opening at the end of the rectum is the anus. It marks the exit of the digestive tract through the anal canal and is equipped with two sphincters: the internal anal sphincter (involuntary smooth muscle) and the external anal sphincter (voluntary skeletal muscle). Together, they control continence and defecation, allowing the body to regulate when waste exits. The other structures mentioned are different parts of the digestive tract: the pylorus is the stomach’s exit to the duodenum, the esophagus is the tube that carries swallowed material to the stomach, and the ileocecal valve sits between the ileum and the cecum.

The muscular opening at the end of the rectum is the anus. It marks the exit of the digestive tract through the anal canal and is equipped with two sphincters: the internal anal sphincter (involuntary smooth muscle) and the external anal sphincter (voluntary skeletal muscle). Together, they control continence and defecation, allowing the body to regulate when waste exits. The other structures mentioned are different parts of the digestive tract: the pylorus is the stomach’s exit to the duodenum, the esophagus is the tube that carries swallowed material to the stomach, and the ileocecal valve sits between the ileum and the cecum.