The rectum is the final section of the large intestine in the human body. It connects the sigmoid colon to the anus and serves as a temporary storage site for feces before they are expelled. The rectum is about 12 centimeters long and plays a crucial role in the digestive system. When the rectum fills with stool, nerve signals are sent to the brain, indicating the need to defecate. This process helps regulate bowel movements and maintain overall digestive health. Proper function of the rectum is essential for effective waste elimination from the body.