Question at position 7 Most chemical digestion occurs in the _________.StomachDuodenumLarge intestineIleumJejunum

Question

Question at position 7 Most chemical digestion occurs in the _________.StomachDuodenumLarge intestineIleumJejunum

BlackTom AI · Accepted Answer

Let's break down where chemical digestion happens and what each section of the digestive tract contributes.
Option: Stomach. The stomach is where mechanical mixing occurs and where some chemical digestion starts (notably via pepsin and acidic conditions), but most of the enzymatic digestion of carbohydrates, proteins, and fats occurs after chyme moves into the small intestine. This makes the stomach not the primary site for chemical digestion overall.
Option: Duodenum. This is the first section of the small intestine and receives chyme from the stomach along with digestive secretions from the pancreas and bile from the liver. Pancreatic enzymes (amylase, proteases, lipases) and bile acids mix with chyme here, enabling extensive chemical digestion of carbohydrates, proteins, and fats. This makes the duodenum the main zone for chemical digestion.
Option: Large intestine. The large intestine chiefly handles water reabsorption and the formation of solid waste; it plays a minor role in chemical digestion, primarily involving microbial fermentation, not enzymatic breakdown of most nutrients. Hence, it is not the primary site of chemical digestion.
Option: Ileum. While the ileum is important for absorption of bile acids and vitamin B12 and continues some digestive processes, its role is not the main site of chemical digestion. Absorption is the dominant function there, rather than digestion.
Option: Jejunum. The jejunum is the major site of nutrient absorption and continues digestion driven by pancreatic enzymes, but the most substantial and initial enzymatic digestion of macronutrients occurs earlier in the duodenum. Therefore, while important for digestion, it is not the single primary site of chemical digestion like the duodenum.
In summary, the duodenum uniquely serves as the primary locale where the bulk of chemical digestion is carried out due to the concerted action of pancreatic enzymes and bile immediately after chyme enters from the stomach.

Question at position 7 Most chemical digestion occurs in the _________.StomachDuodenumLarge intestineIleumJejunum单项选择题

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