Question

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write the action of →trypsin on protien
→ pepsin on proties
→ amylase on starch
→ lipase on fats
→functions of bile juice
→ place where bile is store and the place where bile is secreted
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Answer 1

The digestion of proteins start in the stomach and gets completed in the small intestine. These enzymes that act on proteins are known as proteases.

The digestive juice secreted in the gastric glands present on the stomach walls is called gastric juice. The main components of gastric juice are HCl, pepsinogen, and rennin. The food that enters the stomach becomes acidic on mixing with this gastric juice. The acidic medium converts inactive pepsinogen into active pepsin. The active pepsin then converts proteins into proteases and peptides.

Proteins (in the presence of Pepsin) → Proteoses + Peptides

The enzyme rennin plays an important role in the coagulation of milk.

In the small intestine, the food from the stomach is acted upon by three juices present in the small intestine – pancreatic juice and intestinal juice (known as succus entericus).

Pancreatic juice contains a variety of inactive enzymes such as trypsinogen, chymotrypsinogen, and carboxypeptidases. The enzymes are present in an inactivated state. The enzyme enterokinase secreted by the intestinal mucosa activates trypsinogen into trypsin.

Trypsinogen (in the presence of Enterokinase) → Trypsin + Inactive peptide

Chymotrypsinogen (in the presence of Trypsin) → Chymotrypsin

Proteins (in the presence of Chymotrypsin) → Peptides.

Peptides (Carboxypeptidase) → Smaller peptide chain + Amino acids.

Bile juice has bile salts such as bilirubin and biliverdin which break down large, fat globules into smaller globules so that pancreatic enzymes can easily act on them. This process is known as emulsification of fats. Bile juice also makes the medium alkaline and activates lipase. Lipase then breaks down fats into diglycerides and monoglycerides.

Intestinal juice contains a variety of enzymes. Pancreatic amylase digests polysaccharides into disaccharides. 

Peptides (in the presence of dipeptidases) →  Amino acids.

Pancreatic lipase breaks down fats into diglycerides and monoglycerides and the nucleases break down nucleic acids into nucleotides and nucleosides.

Answer 2

→trypsin and pepsin

protiens to peptone

→amylase

starch to maltose

→lipase

fat to fatty acid and glycerol

→bile

convert large globules of fats to emulsified fats

and also reduces the pH of the partially digested food coming to intestine from stomach

→ bile is stored in gall bladder

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