THORAX ABDOMEN AND PELVIS

Detailed explanation-1: -The majority of chemical digestion occurs in the small intestine.

Detailed explanation-2: -There are approximately 200 million microvilli per square millimeter of your intestine. The microvilli helps increase the surface area in your intestine. They help make chemical digestion and absorption more efficient. Microvilli are covered in brush border enzymes that finish digesting your proteins and carbohydrates.

Detailed explanation-3: -The primary function of the jejunum is to absorb sugars, amino acids, and fatty acids. Both the jejunum and ileum are peritoneal. The ileum absorbs any remaining nutrients that did not get absorbed by the duodenum or jejunum, in particular vitamin B12, as well as bile acids that will go on to be recycled.