Final answer:
Weighted Naso-intestinal (NI) tubes are designed to float from the stomach to the jejunum, which is part of the small intestine, for direct nutrition delivery.
Step-by-step explanation:
The question pertains to Naso-intestinal tubes, specifically Weighted NI tubes, which are used in medical procedures to deliver nutrition directly to the small intestine. These tubes are designed to float from the stomach through the small intestine to ensure proper placement for nutrition delivery. Given the structure of the gastrointestinal (GI) tract, which is a long continuous tube starting from the mouth and ending at the anus, the correct answer is that Weighted NI tubes must float from the stomach to the jejunum, which is option (a). This pathway bypasses the more proximal part of the small intestine known as the duodenum and proceeds to the next section, the jejunum, before continuing to the ileum, the last segment of the small intestine.