In the mouth
Saliva is slightly alkaline.
Enzymes in saliva convert starch into glucose:
- amylase catalyses: starch → maltose
maltase catalyses: maltose → glucose 
After it has been in the stomach, food travels to the small intestine.
Bile and enzyme production in the liver and pancreas
The enzymes in the small intestine work best in alkaline conditions (but the food is acidic after being in the stomach).
Bile is a substance produced by the liver and stored in the gall bladder. 
Organs and their functions
Mouth - Where food enters the alimentary canal and digestion begins
Salivary glands - Produce saliva containing amylase
Stomach - Muscular organ where digestion continues
Pancreas - Produces digestive enzymes
Liver - Produces bile
Gall bladder - Stores bile before releasing it into the duodenum
Small intestine - duodenum - Where food is mixed with digestive enzymes and bile
Small intestine - ileum - Where digested food is absorbed into the blood and lymph
Large intestine - colon - Where water is reabsorbed
Large intestine - rectum - Where faeces are stored
Large intestine - anus - Where faeces leave the alimentary canal 
In the stomach
The stomach produces hydrochloric acid.
It kills many harmful microorganisms that might have been swallowed along with the food.
The enzymes in the stomach work best in acidic conditions – at a low pH. 
Effects of bile
- neutralises the acid - (providing the alkaline conditions needed in the small intestine)
- emulsifies fats - (providing a larger surface area over which the lipase enzymes can work) 
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