Digestion in small intestine and parts name

Digestion in Small Intestine

• 3 types of secretions are released into the intestine.

	Pancreatic juice released by hepatopancreatic duct	Bile	Intestinal juice (succus entericus)
1.	Contains inactive enzymes such as trypsinogen, chymotrypsinogen, procarboxypeptidase, amylase, lipase, nuclease, etc.	Contains bile pigments (Bilirubin and biliverdin), bile salts, cholesterol phospholipids	Contains enzymes such as maltase dipeptidase, lipase nucleosidase, etc.
2		Bile contains no enzyme.	Also contains mucus which in combination with bicarbonates released by pancreas provides alkaline medium and prevents intestinal mucosa from acid
3.		It emulsifies fats into micelles and activates  lipases.

Digestion of fats takes place in the small intestine with the help of bile juice which acts as emulsifier and breaks down the larger fat droplets into smaller ones. They are then acted upon by lipase enzyme found in pancreatic juice and intestinal juice which convert them into monoglycerides and fatty acids respectively.


The small intestine consists of three parts. The first part, called the duodenum, connects to the stomach. The middle part is the jejunum. The third part, called the ileum, attaches to the colon. 

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