What is the correct order of the small intestine sections?

The small intestine consists of three main sections that are organized in a specific sequence: the duodenum, jejunum, and ileum. The duodenum is the first part where the majority of chemical digestion occurs, receiving digestive enzymes from the pancreas and bile from the liver. Following the duodenum, the jejunum serves as the primary site for nutrient absorption. Finally, the ileum is the last section, where the remaining nutrients are absorbed before the contents pass into the large intestine.

Understanding the correct order is crucial for grasping how digestion and absorption processes function in the gastrointestinal system. By recognizing that the duodenum comes first, followed by the jejunum and then the ileum, one can appreciate the coordinated nature of digestive processes occurring sequentially in these sections.

Other options do not reflect the actual anatomical arrangement of the small intestine, as they either misplace the order of these sections or incorrectly include structures that are not part of the small intestine. Thus, option B accurately depicts the standard order of the small intestine's sections.