Which has greater adaptive capacity: ileum or jejunum?

Which has greater adaptive capacity: ileum or jejunum?

• A. Duodenum
• B. Jejunum
• C. Ileum
• D. Colon

Answer: (C)

Adaptive capacity refers to how readily a segment of the intestine can remodel structurally and functionally to maximize absorption when challenged or shortened. The ileum shows the strongest adaptive response among the segments discussed. Its mucosa readily undergoes hypertrophy, with increased villus height and crypt activity, and it can upregulate absorptive transporters and brush-border enzymes in the remaining bowel. This plasticity helps the ileum compensate for changes in length or function, maintaining nutrient and fluid absorption more effectively than the jejunum. The colon and the proximal small intestine do not match this level of small-bowel–specific adaptation, and while the jejunum can adapt, its capacity is not as robust as that of the ileum.

Adaptive capacity refers to how readily a segment of the intestine can remodel structurally and functionally to maximize absorption when challenged or shortened. The ileum shows the strongest adaptive response among the segments discussed. Its mucosa readily undergoes hypertrophy, with increased villus height and crypt activity, and it can upregulate absorptive transporters and brush-border enzymes in the remaining bowel. This plasticity helps the ileum compensate for changes in length or function, maintaining nutrient and fluid absorption more effectively than the jejunum. The colon and the proximal small intestine do not match this level of small-bowel–specific adaptation, and while the jejunum can adapt, its capacity is not as robust as that of the ileum.