AP BIOLOGY

Detailed explanation-1: -By the time indigestible materials have reached the colon, most nutrients and up to 90% of the water has been absorbed by the small intestine. The role of the ascending colon is to absorb the remaining water and other key nutrients from the indigestible material, solidifying it to form stool.

Detailed explanation-2: -Absorption of ingested water and most solutes occurs in the proximal small intestine, therefore the rate at which beverages are emptied from the stomach is an important factor in determining the rate of water absorption.

Detailed explanation-3: -The majority of water’s absorption into the bloodstream occurs after water passes through the stomach and into the small intestine. The small intestine, at around 20 feet long, is the organ primarily responsible for water absorption through its walls and into the bloodstream.

Detailed explanation-4: -The large intestine absorbs water and changes the waste from liquid into stool.