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