B2 The Digestive System

Digestion is the breaking down of food into soluble products which can be absorbed in the body.

The breakdown of food is catalysed by enzymes.

Carbohydrases- e.g Amylase - digest starch into sugars.

Proteases - e.g Pepsin - digest protein into amino acids

Lipase digest fat into fatty acids and glycerol.

                                       The digestive system 

• The mouth

The mouth moistens the food by saliva which is made in the salivary glands. The salivary glands produce Amylase enzymes, which break down starch into sugars. 

The food is chewed into…