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The Digestive System
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| What are the three functions of the digestive system | 1. Breaks down food into molecules the body can use. 2. The molecules are absorbed into the blood as nutrients and carried throughout the body. 3. Waste are eliminated from the body |
| digestion | The process by which body breaks down food into small nutrient molecules |
| What are two types of digestion | Mechanical and chemical |
| Mechanical digestion | Chewing food using your teeth, saliva softens the food to make it easier to chew and swallow |
| Chemical digestion | Saliva breaks down starch into sugars |
| Saliva | An enzyme called amylase |
| Esophagus | Muscular tube that connects mouth to stomach |
| How long does it take food to travel to the stomach after you swallow? | 10 seconds |
| Small intestine | The part of the digestive system in which most chemical digestion takes place |
| Liver | The largest and heaviest organ inside the body. It produces bile |
| Bile | A substance produced by the liver that breaks up fat particles. |
| Gallbladder | The organ that stores bile after it is produced by the liver |
| Pancreas | A triangular Oregon that produces enzymes that flow into the small intestine |
| Villi | Tiny finger shaped structures that cover the inner surface of the small intestine and provide a large surface area through which digested food is absorbed. |
| Large intestine | The last section of the digestive system where water is absorbed from food and they remaining material is eliminated from the body |
| Rectum | A short tube at the end of the large intestine where waste material is compressed into a solid form before being eliminated |
| Anus | The opening at the end of an organism's digestive system through which waste exits |