| A | B |
|---|
| Digestion is | breaking food down into simpler substances. |
| Digestive enzymes are | chemicals that help digest food. |
| Why must food be digested? | Some food are insoluble (cannot be dissolved) and are mode up of very large partcles. |
| Insoluble food and food made up of large particles | cannot be absorbed into the blood. Therefore food must be broken down into simpler substances before it can be used. |
| In the 10-meter long muscular tube called the digestive canal | food is digested step by step into simpler and smaller substances |
| The digestive canal consists of the | mouth, gullet, stomach, small intestine, large intestine and anus. |
| In the mouth, your teeth | cut food into smaller pieces. |
| In your mouth, saliva mixes with the | food to make it soft. |
| The enzyme in the saliva | starts to digest food into simpler substances |
| The tongue | rolls the partly digested food into small balls which are swallowed into your gullet. |
| In the gullet, no digestion takes place and the gullet | pushes the balls of food down to your stomach. |
| When the food reaches the stomach, it mixes food with | acids and enzymes. |
| The stomach squeezes the food and | moves the food round and round. |
| In the stomach the food continues to be digested | to become simpler substances and the partly digested food almost becomes a liquid. |
| The liquid food in the stomach flows into the | small intestine a little at a time. |
| In the small intestine, | different enzymes are present. Most of the remaining food that is not digested will be digested here. |
| In the small intestine, the small particles can now | absorbed into the blood. Some vitamins and minerals are also absorbed into the blood. |
| Food that is not digested or not absorbed moves on | to the large intestine. |
| In the large intestine, | most of the water and minerals are absorbed from the undigested food. |
| The undigested food becomes a | semi-solid waste called faeces. |
| Faeces is stored at the | lower part of the large intestine. |
| The anus is an | opening through which faeces is passed out of the body. |
