The Digestive System

• Digestion is the process of breaking down large molecules of food into small soluble molecules so that they can be absorbed into the bloodstreams and unnecessary substances can be excreted.
• The mouth physically breaks down food.
• Salivary glands release amylase in order to break down starch.
• The oesophagus carries food to the stomach.
• The stomach contains acid to kill bacteria. Protease in the stomach also breaks down proteins.
• The liver produces bile to break down fats.
• The gall bladder stores bile.
• The pancreas produces amylase, protease and lipase.
• The small intestine absorbs nutrients such as glucose.
• The large intestine absorbs water and produces vitamin K.
• The rectum stores faeces and the anus pushes faeces out.
• The digestive system is an example of an organ system in which several organs work together to digest and absorb food.