Question

assignment details (fall 2025 - e) hun1201: human nutrition 819(15... another group will discuss the digestion of rice pilaf. please guide yourself by the anatomical segments of the gi tract, and discuss the relevant events in each of the segments. for example, what happens in the mouth? which enzymes start working in saliva? et cetera... please follow up in the very end, with a discussion on how insulin/glucagon regulate the blood sugar levels due to the incoming nutrients. refer to discussion guidelines. click the gear icon in the top right corner to see the rubric and how you will be graded for this assignment.

Explanation:

Step1: In the mouth

Salivary amylase in saliva starts breaking down starches in rice pilaf and fries into smaller polysaccharides. Mechanical digestion also occurs through chewing.

Step2: In the esophagus

Food is pushed down to the stomach by peristalsis, no chemical digestion occurs here.

Step3: In the stomach

Gastric juices containing hydrochloric acid and pepsin act on proteins in the food (if any). The acidic environment helps in food breakdown and kills some bacteria. But starches are not significantly digested here.

Step4: In the small intestine

Pancreatic amylase further breaks down remaining starches into maltose. Maltase then breaks maltose into glucose. Proteases and lipases also act on proteins and fats respectively. Nutrients are absorbed through the intestinal wall into the bloodstream.

Step5: Blood - sugar regulation

When glucose is absorbed into the bloodstream, blood sugar levels rise. The pancreas secretes insulin which promotes the uptake of glucose by cells for energy or storage as glycogen. If blood sugar levels drop, the pancreas secretes glucagon which stimulates the breakdown of glycogen into glucose to raise blood sugar levels.

Answer:

The digestion of rice pilaf and fries starts in the mouth with salivary amylase, passes through the esophagus to the stomach, is further digested in the small intestine with pancreatic and intestinal enzymes, and blood - sugar levels are regulated by insulin and glucagon secreted by the pancreas.