Canadian Society for Medical Laboratory Science (CSMLS) Practice Exam

Which structures are found in the small intestine?

1. Jejunum, colon, ileum

2. Duodenum, jejunum, cecum

3. Duodenum, jejunum, ileum

4. Duodenum, colon, celum

The correct answer is: Duodenum, jejunum, ileum

The small intestine consists of three main sections: the duodenum, jejunum, and ileum. While the duodenum is responsible for the initial phase of digestion, where enzymes and bile salts mix with the chyme, the jejunum is primarily involved in the absorption of nutrients and the ileum further absorbs nutrients, particularly vitamin B12 and bile salts, before the remaining material moves into the large intestine. Answer option C accurately identifies these three sections, making it correct in context. Understanding the distinct roles of each section is essential for comprehending how the digestive system processes food and absorbs nutrients effectively. The other options include structures that do not belong to the small intestine or mix sections from different parts of the digestive tract, leading to their inaccuracy.