The Digestive system The digestive process begins in the mouth as food is mixed with saliva and broken down into starches_ and simple sugars. Teeth chop.

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Presentation transcript:

The Digestive system The digestive process begins in the mouth as food is mixed with saliva and broken down into starches_ and simple sugars. Teeth chop and grind up food to make it easy to swallow. This mashed food is pushed by the tongue and carried to your stomach through the_esophagus.

 The stomach is a J shaped bag with a muscular lining. These muscles, along with strong chemical juices, (enzymes and gastric acid) mix and break down food into a thick liquid. The stomach is coated with a thick layer of mucus that is renewed every 3 days so it cannot digest itself. This thick liquid travels from the stomach to the small intestine where food is converted into vitamins and nutrients. In an adult, the intestines are about 6 to 9metres long.

 The biggest internal organ, the liver, converts food into energy. Vitamins and minerals collect here and travel into the bloodstream. Excess water is removed in the large intestine and sold waste leaves the body through the anus (rectum).  Excess water and chemical build up in the blood are filtered out by the kidneys and sent to the bladder to be disposed on as urine.

 Every day your digestive system handles10 litres of food and drink. Only _125ml  leaves your body as waste.  The main function of the Digestive System is the chemical and _physical breakdown of food into molecules small enough to pass into cells.

 The main organs that make up the digestive system are _stomach, esophagus, liver, and intestines.  The major tissues of the digestive system are nerve, connective, epithelial, and muscle.