The human digestive system


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The human digestive system

  1. 1. The Human Digestive System John Lee Pri. 4B
  2. 2. The Mouth <ul><li>In mammals, food enters the mouth and is chewed by the teeth into tinier pieces. </li></ul><ul><li>The enzymes in the saliva break down some of the starch and fat in the food. </li></ul>
  3. 3. The Gullet <ul><li>The esophagus is also known as the gullet, is a muscular tube through which food travels to the stomach. </li></ul><ul><li>The rhythmic muscle movement of the gullet gives us the ability to eat or drink even when we're upside-down! </li></ul>
  4. 4. The Stomach <ul><li>The stomach is a large, sack-like organ that breaks down the food and bathes it in a very strong acid. </li></ul><ul><li>The stomach has a very strong wall lining to withstand the acid and is elastic enough to contain up to 2 litres of food and liquids. </li></ul>
  5. 5. The Small Intestine <ul><li>The small intestines measure about 6 metres in length! </li></ul><ul><li>Its huge surface area absorbs 90% of nutrients and water the body will receive from digested food. </li></ul>
  6. 6. The Large Intestine <ul><li>The large intestine absorbs the last bits of nutrients and water from indigestible food. </li></ul><ul><li>It then compacts the remaining matter and eliminates it as waste (faeces). </li></ul>
  7. 7. Recommended Food Intake <ul><li>Here is a chart you can use to help ensure you're meeting key nutrient needs. Nutrient needs are best met by choosing a variety of different foods. </li></ul>
  8. 8. References <ul><li> </li></ul><ul><li> </li></ul><ul><li> </li></ul><ul><li> </li></ul>