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THE DIGESTIVE SYSTEM The body system in which digestion takes place is known as the digestive system. It is made up of several structures collectively known as the alimentary canal or gut. The diagram below shows a diagram of the digestive system. Study the diagram carefully and note the relative sizes of the various parts. Identify the areas where salivary amylase, pepsin and pancreatic lipase are produced and where they function. Draw a simple diagram of the human digestive system. It is important that the size of each region is accurate and openings are shown correctly. Label the following structures: mouth, oesophagus, stomach, small intestine, large intestine, anus, liver, pancreas and gall bladder. You do not need to draw in structures that are not involved in digestion or absorption. Make sure you can draw this diagram from memory. You must be able to correctly represent and label the structures listed above. You do not need to draw the body outline. Extension for higher level students Below is a picture showing the layers of the wall of the gut. This will be useful for you later on if you study the Further Human Physiology Option.