The Digestive System

• it produces a green-yellowish liquid called bile • bile does not contain enzymes • it’s stores excess glucose • it breaks down proteins into urea • it breaks down harmful substances such as alcohol and drugs

• the muscles of the gullet wall contract and relax to push the food down into the stomach • no enzymes are produced here

• the teeth are used to break down large pieces of food into smaller pieces • the salivary glands secrete saliva • saliva contains enzymes that digests starch • The tounge rolls the food into the gullet

• mouth • gullet / oesophagus • stomach • small intestine • large intestine • rectum and anus

• it is a muscular sac • it mashes up food into a liquid mixture • it produces a digestive juice that contains acid and enzymes • the acid kills the bacteria in food • the enzymes helps to digest protiens • the food later leaves bit by bit into the small intestine

• it receives the digested food from the pancreas and bile from the gall bladder • it also receives digestive enzymes • different enzymes in the small intestine helps to speed up digestion of nutrients until the food is completely digested • the digested food is absorbed through the walls of the small intestine into the blood stream and carried to all parts of the body • digestion stops here

• bile which is produced by the liver is stored in the gall bladder • it releases bile into the small intestine

• it produces enzymes that digests carbohydrates , protein and fats • it also releases some enzymes into the small intestine

• no digestion happens here • excess water , vitamins and mineral salts are absorbed through the walls of the large intestine and into the blood stream • the undigested food moves to the rectum and anus

• the digested food is stored in the rectum • the faeces leaves the body through the anus • no digestion occurs here

faeces refers to the undigested food

it is the physical way of digesting food by breaking down large pieces of food into smaller and simpler pieces

liver , gall bladder and pancreas