AP BIOLOGY

Detailed explanation-1: -The simple molecules that result from chemical digestion pass through cell membranes of the lining in the small intestine into the blood or lymph capillaries. This process is called absorption.

Detailed explanation-2: -The small intestine is the area for absorption of digested food. Water is absorbed both in the small intestine and colon but most occurs in the small intestine. The small intestine has villi and microvilli. These are finger-like projections that increase the surface area over which molecules are absorbed.

Detailed explanation-3: -The small intestine absorbs most of the nutrients in your food, and your circulatory system passes them on to other parts of your body to store or use. Special cells help absorbed nutrients cross the intestinal lining into your bloodstream.

Detailed explanation-4: -Protein Absorption Active transport mechanisms, primarily in the duodenum and jejunum, absorb most proteins as their breakdown products, amino acids. Almost all (95 to 98 percent) protein is digested and absorbed in the small intestine.