Question:
The main site of water absorption is?
The main site of water absorption is?
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Compare absolute volumes: the proximal small bowel reclaims the most, not the colon.
Updated On: Jun 24, 2026
- Jejunum
- Colon
- Ileum
- Stomach
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The Correct Option is A
Solution and Explanation
Step 1: Each day a large volume of water enters the gastrointestinal tract. About 2000 mL is ingested and about 7000 mL comes from endogenous secretions (saliva, gastric, pancreatic, biliary and intestinal secretions), giving a total water load of roughly 9000 mL.
Step 2: The bulk of this fluid is reabsorbed in the small intestine. Approximately 5500 mL is reabsorbed in the jejunum and about 2000 mL in the ileum.
Step 3: The colon reabsorbs about 1300 mL, and the remaining roughly 200 mL is lost in the stool.
Step 4: Comparing the figures, the jejunum reabsorbs the largest single volume of water, far more than the ileum, colon or stomach.
Conclusion: The main site of water absorption is the jejunum, so option A is correct.
Step 2: The bulk of this fluid is reabsorbed in the small intestine. Approximately 5500 mL is reabsorbed in the jejunum and about 2000 mL in the ileum.
Step 3: The colon reabsorbs about 1300 mL, and the remaining roughly 200 mL is lost in the stool.
Step 4: Comparing the figures, the jejunum reabsorbs the largest single volume of water, far more than the ileum, colon or stomach.
Conclusion: The main site of water absorption is the jejunum, so option A is correct.
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