Discuss how the gut and airways "taste" also
What will be an ideal response?
Scientists have discovered cells in the stomach and intestine that have the same GPCRs and gustducin-activated pathways for "tasting" sweet, umami, and bitter as those in the tongue taste buds. The gut taste cells sense the chemical composition of the contents in the lumen of the digestive tract and are believed to trigger physiological responses important in dealing with the food.
For example, when the gut taste cells detect something sweet, they initiate a cascade of events leading to production of molecules that stimulate gut motility, enhance absorption of glucose by the digestive tract, stimulate secretion of insulin in anticipation of the blood-borne arrival of absorbed sweet food, and contribute to the sensation of being full. By contrast, detection by the gut taste cells of something bitter (suggestive of being potentially toxic) slows absorption or spurs vomiting.
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