Reabsorption of water in the GIT – Physiology MCQ

Reabsorption of water in the GIT is maximum in?

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

Correct answer : B. Jejunum

Daily turnover of water in the gastrointestinal system

Input of water in the GIT

  • Ingested water – 2000 ml
  • Endogenous secretions – 7000 ml
    • Salivary glands – 1500 ml
    • Stomach – 2500 ml
    • Bile – 500ml
    • Pancreas – 7000 ml
  • Total input – 9000 ml

Reabsorption of water in the GIT

  • Jejunum – 5500 ml
  • Ileum – 2000 ml
  • Colon – 1300 ml
  • Total reabsorption – 8800 ml

Water lost in stool – 200 ml

Ref: Ganong 22nd ed, p476

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