Which of the following is the primary absorptive process in the large intestine?

Options

A. Active transport of `Na^(+)` from the lumen to the blood
B. Absortion of amino acids and fructose
C. Active transport of potassium from the lumen to the blood
D. Active absorption of `HCO_(3)^(-)` into the blood

Answer

A

Explanation

The mucosa of large intestine has a high capability for active absorption of sodium ions which create a gradient for chloride ions absorption as well. This forms an osomotic gradient across the large intestinal mucosa causing absorption of water.