Anatomy and Physiology II Practice Test

What is the primary function of the sigmoid colon?

1. Storage of fecal material before excretion

2. Absorption of nutrients

3. Digestion of starches

4. Production of bile

The correct answer is: Storage of fecal material before excretion

The primary function of the sigmoid colon is indeed the storage of fecal material before excretion. The sigmoid colon is the S-shaped section of the large intestine that connects the descending colon to the rectum. This area acts as a temporary storage site for feces, allowing for the consolidation of material and preparation for elimination from the body. The sigmoid colon plays a crucial role in the overall process of digestion, as it receives waste material from the colon and allows for the reabsorption of water and electrolytes. This process helps to form solid waste, which is then stored until it is convenient to be expelled from the body. The storage feature of the sigmoid colon is vital because it provides control over bowel movements, contributing to the normal functioning of the gastrointestinal system. In contrast, the other options refer to functions that take place in different parts of the digestive system. Nutrient absorption primarily occurs in the small intestine, digestion of starches mainly takes place in the mouth and small intestine, and bile production is a function of the liver. Thus, the specific function of the sigmoid colon as a storage site for fecal matter is what makes this option the most accurate choice.