Which part of the colon joins the rectum?

• A. Cecum
• B. Transverse colon
• C. Sigmoid colon
• D. Ascending colon

Answer: (C)

Verified step by step guidance

1. Step 1: Begin by understanding the anatomy of the colon, which is part of the large intestine. The colon is divided into several sections: cecum, ascending colon, transverse colon, descending colon, and sigmoid colon.
2. Step 2: Recall the function and location of the sigmoid colon. It is the S-shaped part of the colon located near the end of the large intestine, connecting the descending colon to the rectum.
3. Step 3: Compare the anatomical positions of the other options provided: Cecum is the beginning of the large intestine, located near the junction with the small intestine; Ascending colon is the vertical section on the right side of the abdomen; Transverse colon is the horizontal section across the abdomen.
4. Step 4: Eliminate the incorrect options based on their anatomical positions and functions. The cecum, ascending colon, and transverse colon are located earlier in the digestive tract and do not directly connect to the rectum.
5. Step 5: Conclude that the sigmoid colon is the correct answer because it is the final section of the colon that directly joins the rectum.