Final answer:
Glucose detectors are located in the gut, particularly in the 2. duodenum, which is where most chemical digestion and subsequent absorption of glucose into the blood occurs.
Step-by-step explanation:
Detectors for glucose are primarily located within the gut, specifically in the duodenum, which is the first part of the small intestine. The duodenum is the region where most chemical digestion takes place, including the digestion of carbohydrates into glucose. Enzymes from the pancreas and bile from the liver contribute to the breakdown of food in the duodenum, allowing glucose and other nutrients to be absorbed into the bloodstream.