The Digestive System. The Digestive Tract The Mouth The Stomach The Small Intestine The Oesophagus The Large Intestine.

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Digestive System

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Presentation transcript:

The Digestive System

The Digestive Tract The Mouth The Stomach The Small Intestine The Oesophagus The Large Intestine

The Mouth This is where digestion begins. Chewing physically breaks down food. Saliva contains an enzyme that chemically breaks down starch. Saliva also helps the chewing and swallowing actions.

The Oesophagus This is a hollow muscular tube which leads to the stomach. Muscular contractions push the food down to the stomach (even if you are standing on your head).

The Stomach The stomach churns and mixes food. Enzymes in the stomach starts the digestion of protein. Hydrochloric acid is also released which will kill bacteria and get the enzymes working.

The Small Intestine Seven meters long coiled up. Small molecules resulting from the digestive process pass through the wall into the blood vessels to be carried throughout the body. Starch and protein digestion are completed. Fat digestion occours.