Small intestine: The small intestine is made up of the duo- denum (also referred to as the duodenal loop) and the lower small intestine. The duodenum receives digestive enzymes and bicarbonate (to counter the hydrochloric acid from the proventriculus) from the pancreas and bile from the liver via the gall bladder. The digestive enzymes produced by the pancreas are primarily involved in protein digestion. Bile is a detergent that is important in the digestion of lipids and absorption of fat-soluble vita- mins (vitamins A, D, E and K). The remainder of the digestion occurs in the duodenum and the released nutrients are absorbed mainly
in the lower small intestine. The lower small intestine is composed of two parts, the jejunum and ileum. The Meckel’s Diverticulum marks the end of the jejunum and the start of the ileum.