3. The Digestive System Mouth Mouth Esophagus Esophagus Stomach Stomach Small Intestine Small Intestine Liver Liver Large Intestine Large Intestine Gall Bladder Gall Bladder Pancreas Pancreas Rectum Rectum Anus Anus Let’s find out what happened to your breakfast today! (Breaking food down into smaller pieces)

4. Mouth Teeth Teeth (mechanical breakdown) –Incisors used for cutting –Canines used for stabbing and holding –Molars large surface area used for grinding Saliva Saliva (chemical breakdown) –Enzyme (speeds up reactions in the body) –Breaks down carbohydrate

5. Esophagus Approximately 25cm long Approximately 25cm long Moves food from the throat to the stomach Moves food from the throat to the stomach –Muscle movement called peristalsis If acid from the stomach gets in here that’s heartburn. If acid from the stomach gets in here that’s heartburn.

6. Stomach Stores the food you eat Stores the food you eat Chemically breaks it down into tiny pieces Chemically breaks it down into tiny pieces Mixes food with digestive juices Mixes food with digestive juices Acid in the stomach kills bacteria Acid in the stomach kills bacteria

7. Small Intestine Small intestines are roughly 6 metres long. Small intestines are roughly 6 metres long. Enzymes and bile are added. Enzymes and bile are added. Villi increase the surface area to help absorption. Villi increase the surface area to help absorption. Nutrients from the food pass into the bloodstream through the small intestine walls. Nutrients from the food pass into the bloodstream through the small intestine walls.

8. Liver Directly affects digestion by producing bile Directly affects digestion by producing bile –Bile is an enzyme that helps dissolve fat Processes nutrients in the blood, filters out toxins and waste. Processes nutrients in the blood, filters out toxins and waste. Is often called the body’s energy factory Is often called the body’s energy factory

9. Gall Bladder Stores bile from the liver Stores bile from the liver Delivers bile when food is digested Delivers bile when food is digested Fatty diets can cause gallstones Fatty diets can cause gallstones

10. Pancreas Produces compounds to digest fats and proteins Produces compounds to digest fats and proteins Neutralizes acids that enter small intestine Neutralizes acids that enter small intestine Regulates blood sugar by producing insulin Regulates blood sugar by producing insulin

11. Large Intestine About 1.5 metres long About 1.5 metres long Accepts what small intestines don’t absorb. Accepts what small intestines don’t absorb. Absorbs water and minerals from the waste matter. Absorbs water and minerals from the waste matter. Absorption means taking into the body via the blood stream. Absorption means taking into the body via the blood stream.

12. Rectum and Anus Rectum Rectum –About 15cm long –Stores waste before egestion. Anus Anus –Muscular ring that controls egestion.

13. Write the name of each colored organ: Green: Green: Red: Red: Pink: Pink: Brown: Brown: Purple: Purple: Green: Green: Yellow: Yellow: