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Digestion & absorption intestinale

Ileum

Last section of the small intestine absorbing vitamin B12 and completing absorption.

Definition

Third and last part of the small intestine, approximately 3.5 meters long, specialized in the absorption of vitamin B12, bile acids, and water.

How it works

The ileum completes the absorption process started in the duodenum and jejunum. It specifically absorbs vitamin B12 (cobalamin), bile acids, and remaining nutrients. The ileum also absorbs a significant amount of water, which is crucial for maintaining the body's fluid balance. The ileum mucosa contains lymphoid tissue that plays an immune role. At the end of the ileum is the ileocecal valve that controls the passage of undigested residues to the colon.

Role

Absorb vitamin B12, bile acids, water, and complete nutrient absorption.

Examples

  • Absorption of vitamin B12 from meat
  • Bile acid reabsorption
  • Passage of water into the circulation

Recommendations

Include vitamin B12 sources (meat, dairy, eggs) for ileal absorption. Maintain good hydration to favor water absorption. Preserve the health of the ileum by consuming fiber and probiotics.

Key takeaway

The ileum absorbs vitamin B12 and completes water and remaining nutrient absorption.

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