Question

The sigmoid colon is a part of:
A. Large intestine
B. Small intestine
C. Pharynx
D. Rectum

Answer 1

In the gastrointestinal tract in the digestive system of vertebrates last part is the large intestine. It is also called the large bowel. The rectum is the last part of the large intestine. The small intestine is longer than the large intestine and is the principal organ of digestion.

Complete answer: Sigmoid colon, also known as the pelvic colon is a part of the large intestine and is the part lying closest to the rectum and anal opening. It is S-shaped, curved, a slightly dilated part of the GIT, and is the last part of the colon. It is a hollow tube with two open ends of length 35-40 cm approximately. The function includes providing a passage to fecal matter to flow from the upper part of the large intestine into the rectum. The fecal matter is stored here until a signal comes with which it allows the stool to pass via the rectum and through the anal canal to outside the body. Therefore, it acts as a storage site for fecal matter. According to options,
-Large intestine- Large intestine consists of the caecum, ascending colon, transverse colon, descending colon, sigmoid colon, and rectum. Briefly, it can be divided into caecum, colon, and rectum.
-Small intestine- Small intestine consists of the duodenum, ileum, and jejunum.
-Pharynx- It is a part of the upper respiratory tract and is located behind the nose. It can be divided into nasopharynx, oropharynx, and laryngopharynx.
-Rectum- Rectum is the last part of the large intestine and lies next to the sigmoid colon.
The sigmoid colon is the lower third part of the human large intestine and is connected to the rectum so the sigmoid colon is a part of the large intestine.
Hence, the correct answer is A.

Note: Some disorders associated with a sigmoid colon are:
-Polyps: small cancerous masses or lumps of tissue may develop in the colon. These are not always cancerous.
-Diverticula: Small sac-like protrusions can arise from the colon which can occasionally cause symptoms like abdominal pain, abscess formation, pus, or vomiting.