Maximum water reabsorption in the
Gastrointestinal tract occurs in ?
a) Stomach
b) Jejunum
c) Ileum
d) Colon
Correct Answer - B
Ans. is ‘b’ i.e., Jejunum
Water absorption from GIT
Water and electrolytes need no digestion and are absorbed as such.
There is approximately 9 liters of water input : Ingested water : 2.0
litres, Saliva : 1.5 litres, gastric juice : 2.5 litres, bile 0.5 litre,
pancreatic juice : 1.5 litres, and small intestine secretions 1-0 litre.
Out of these 9 litres, 7.7 litres (85%) is absorbed in small intestine
and 1.0 - 1.5 litres (5-10%) is absorbed in large intestine (colon).
Total 8.8 litres of water is absorbed and 0.2 litre is excreted in feces.
In small intestine, most of the water is reabsorbed in the jejunum.