Vetinerary Assistant Practice Exam

What are three segments of the small intestine?

1. Illium, jejunum, duodenum

2. Stomach, colon, rectum

3. Duodenum, ileum, esophagus

4. Cecum, jejunum, sigmoid

The correct answer is: Illium, jejunum, duodenum

The three segments of the small intestine are correctly identified as the ileum, jejunum, and duodenum. This division of the small intestine is crucial for understanding its function in digestion and nutrient absorption. The duodenum is the first part of the small intestine where the majority of chemical digestion occurs. It receives bile from the liver and pancreatic juices that aid in breaking down food. The jejunum follows, which is primarily responsible for the absorption of nutrients; its structure is adapted for this purpose, featuring a thicker wall and more surface area due to villi and microvilli. Finally, the ileum is the third segment that primarily absorbs vitamin B12 and bile acids, leading into the large intestine. The other combinations in the options pertain to parts of the digestive system but do not correctly identify the segments of the small intestine. The stomach, colon, and rectum refer to different parts of the digestive process and do not include any segments of the small intestine. Similarly, the esophagus is part of the swallowing mechanism and is not a segment of the small intestine. Lastly, the cecum and sigmoid are related to the large intestine rather than the small intestine, further highlighting why choosing the three segments of the small intestine is essential for