ANATOMY

Detailed explanation-1: -Colon is the largest part of the large intestine and here water is largely absorbed from the undigested food.

Detailed explanation-2: -By the time the ingesta enters the large intestine, approximately 80% of this fluid has been absorbed. Net movement of water across cell membranes always occurs by osmosis, and the fundamental concept needed to understand absorption in the small gut is that there is a tight coupling between water and solute absorption.

Detailed explanation-3: -The large intestine functions to absorb any excess water from the material it receives from the small intestine. This also involves the collection of electrolytes, which move with water. Thus, the large intestine works to preserve and absorb water and electrolytes that were not absorbed by previous digestive organs.

Detailed explanation-4: -(ii) Maximum water absorption occurs in large intestine.

Detailed explanation-5: -Most water absorption takes place in the distal third of the small intestine, but the bulk of intestinal water is absorbed by the large intestine. However, Na+ and water absorption in the small intestine is important in absorption of nutrients and other ions.