• Food digestion is a process of breaking down food that is complex into small molecules and soluble so that they can absorbed by the body cells

1)Mouth

• Food is chewed by teeth.
• Salivary amylase in saliva breaks down starch into maltose.

2) Oesophagus 

• Food that enters oesophagus is called bolus.
• The process of peristalsis pushes the food into the stomach.

3)Stomach 

• Wall of stomach secrete protease and hydrochloric acid.
• Hydrochloric acid activates protease which breaks down protein into polypeptides. Semi-liquid food is called chyme.

4) Duodenum 

• Liver produces bile which emulsifies fat into small droplets and neutralises the acid in the chyme.
• Pancreas produces pancrestic juice which contain enzymes amylase,protease and lipase.
• Pancreatic amylase digests starch into maltose
• Protease digests polypeptides into dipeptides
• Lipase digests fat into fatty acids and glycerol

5) Small intestine

• Maltase digests maltose into glucose
• Protease digests dipeptides into amino acids

6) Large intestine

• Undigested food enters large intestine
• The process of water reabsorption happens 

7) Rectum

• Food that is undigested, known as faeces, enters the rectum and is stored here

8) Anus

• Faeces are excreted from the body through the anus

• Food digestion is a process of breaking down food that is complex into small molecules and soluble so that they can absorbed by the body cells

1)Mouth

• Food is chewed by teeth.
• Salivary amylase in saliva breaks down starch into maltose.

2) Oesophagus 

• Food that enters oesophagus is called bolus.
• The process of peristalsis pushes the food into the stomach.

3)Stomach 

• Wall of stomach secrete protease and hydrochloric acid.
• Hydrochloric acid activates protease which breaks down protein into polypeptides. Semi-liquid food is called chyme.

4) Duodenum 

• Liver produces bile which emulsifies fat into small droplets and neutralises the acid in the chyme.
• Pancreas produces pancrestic juice which contain enzymes amylase,protease and lipase.
• Pancreatic amylase digests starch into maltose
• Protease digests polypeptides into dipeptides
• Lipase digests fat into fatty acids and glycerol

5) Small intestine

• Maltase digests maltose into glucose
• Protease digests dipeptides into amino acids

6) Large intestine

• Undigested food enters large intestine
• The process of water reabsorption happens 

7) Rectum

• Food that is undigested, known as faeces, enters the rectum and is stored here

8) Anus

• Faeces are excreted from the body through the anus