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Name the enzymes for protein digestion in the gastric, pancreatic and intestinal juices, the substrates they digest, and the products of their action.
Answer

Enzymes for protein digestion or proteolytic enzymes present in gastric juice are :

Enzymes

Substrate

Products

1.

2.

Pepsin

Rennin

Proteins, casein of milk

Casein protein

Peptones, paracasein

Paracasein

Proteolytic enzymes present in pancreatic juice.

Enzymes

Substrate

Products

1. 

Trypsin

Proteins, fibrinogen, chymotrypsinogen
procarboxy-peptidases,

Proteins, fibrinogen, chymotrypsinogen
procarboxy-peptidases,

2. 

Chymotrypsin

Casein

Paracasein.

3. 

 Carboxy-peptidases

Peptides.

Smaller peptides, amino acids.

Proteolytic enzymes present in pancreatic juice.

Enzymes

Substrate

Products

1.

Enterokinases

Trypsinogen.

Trypsin.

2.

Amino peptidases

Peptides. 

Smaller peptides, aminoacids. 

3. 

Dipeptidases

Dipeptides

Amino acids.