Digestive and excretory systems

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Digestive and excretory systems

  1. 1. The Digestive System Life Science 5 8/08
  2. 2. The digestive system is a group of organs that process the food we eat and takes out the nutrients our bodies need.
  3. 3. It all begins in the mouth where food is broken into small pieces by the teeth and mixed with saliva (spit) which has chemicals that help with digestion.
  4. 4. <ul><li>After food is chewed up and mixed with saliva it moves down a tube called the esophagus. </li></ul>
  5. 5. The esophagus delivers the food to a storage bag, the stomach where it is mixed with other chemicals and digestive juices.
  6. 6. Bile is an important digestive juice that is made in the liver.
  7. 7. After it leaves the stomach the material moves into a long, folded small intestine where the nutrients are removed.
  8. 8. The inside of the small intestine is lined with millions of tiny, finger-like projections called villi ( vil eye). Villi absorb nutrients from our food. Villi is the plural for villus. 1 villus 2 villi
  9. 9. <ul><li>After the nutrients have been removed the watery material moves into the large intestine , also called the colon. </li></ul>The large intestine is shorter but bigger around than the small intestine. Stomach Small intestine Large intestine
  10. 10. <ul><li>Most of the liquid is removed from the used-up food material in a healthy person’s large intestine. </li></ul>After that the solid waste goes into the toilet.
  11. 11. Let’s review: After it leaves the mouth the order of the organs that food passes through is
  12. 12. Let’s review: After it leaves the mouth the order of the organs that food passes through is 1. Esophagus
  13. 13. Let’s review: After it leaves the mouth the order of the organs that food passes through is 1. Esophagus 2. Stomach
  14. 14. Let’s review: After it leaves the mouth the order of the organs that food passes through is 1. Esophagus 2. Stomach 3. Small intestine
  15. 15. Let’s review: After it leaves the mouth the order of the organs that food passes through is 1. Esophagus 2. Stomach 3. Small intestine 4. Large intestine
  16. 17. 1
  17. 18. 1 2
  18. 19. 1 2 3
  19. 20. 1 2 3 4
  20. 22. Excretory system
  21. 23. The excretory system removes cellular waste from the blood.
  22. 24. The excretory system removes cellular waste from the blood. <ul><li>It’s often called the urinary system because urine is how the waste leaves the body. </li></ul>
  23. 25. The main organs in the excretory system are the kidneys.
  24. 26. Every living animal cell creates waste called urea as it uses energy. This waste is carried away in the blood.
  25. 27. Blood flows through the kidneys where urea is removed.
  26. 28. Urea is removed through tiny tubes in the kidneys called nephrons.
  27. 29. Urea and other waste products are sent from the kidneys as urine (a yellow liquid) in tubes called jjjjjjjjjjjj ureters , or urine tubes .
  28. 30. The ureters take urine to a bag-like muscle called the bladder where it is stored until we go to the bathroom.
  29. 31. The excretory system
  30. 32. <ul><li>Let’s review: </li></ul>What is the tube that carries food from the mouth to the stomach ?
  31. 33. <ul><li>Let’s review: </li></ul>What is the tube that carries food from the mouth to the stomach ? The esophagus
  32. 34. <ul><li>Let’s review: </li></ul>What is the tube that carries food from the mouth to the stomach ? The esophagus
  33. 35. <ul><li>Let’s review: </li></ul>Where does food go after it leaves the stomach ?
  34. 36. <ul><li>Let’s review: </li></ul>Where does food go after it leaves the stomach ? Small intestine
  35. 37. <ul><li>Let’s review: </li></ul>Where does food go after it leaves the stomach ? Small intestine
  36. 38. <ul><li>Let’s review: </li></ul>Where is most water removed from food material before it leaves the body ?
  37. 39. <ul><li>Let’s review: </li></ul>Where is most water removed from food material before it leaves the body ? Large intestine also called the colon
  38. 40. <ul><li>Let’s review: </li></ul>Where is most water removed from food material before it leaves the body ? Large intestine also called the colon
  39. 41. <ul><li>Let’s review: </li></ul>Where are nutrients removed from food ?
  40. 42. <ul><li>Let’s review: </li></ul>Where are nutrients removed from food ? Small intestine
  41. 43. <ul><li>Let’s review: </li></ul>Where are nutrients removed from food ? Small intestine The villi
  42. 44. <ul><li>Let’s review: </li></ul>What are two examples of digestive juices ?
  43. 45. <ul><li>Let’s review: </li></ul>What are two examples of digestive juices ? Saliva from the mouth
  44. 46. <ul><li>Let’s review: </li></ul>What are two examples of digestive juices ? Saliva from the mouth
  45. 47. <ul><li>Let’s review: </li></ul>What are two examples of digestive juices ? Saliva from the mouth Bile from the liver
  46. 48. <ul><li>Let’s review: </li></ul>What are two examples of digestive juices ? Saliva from the mouth Bile from the liver
  47. 49. <ul><li>Let’s review: </li></ul>What are the most important organs in the excretory system?
  48. 50. <ul><li>Let’s review: </li></ul>What are the most important organs in the excretory system? The kidneys
  49. 51. <ul><li>Let’s review: </li></ul>What are the most important organs in the excretory system? The kidneys
  50. 52. <ul><li>Let’s review: </li></ul>What do the kidneys do?
  51. 53. <ul><li>Let’s review: </li></ul>What do the kidneys do? They remove cellular waste (urea) from the blood.
  52. 54. <ul><li>Let’s review: </li></ul>What do the kidneys do? They remove cellular waste (urea) from the blood.
  53. 55. <ul><li>Let’s review: </li></ul>What happens to the waste after the kidneys remove it from the blood?
  54. 56. <ul><li>Let’s review: </li></ul>What happens to the waste after the kidneys remove it from the blood? It goes as urine to the bladder.
  55. 57. <ul><li>Let’s review: </li></ul>What happens to the waste after the kidneys remove it from the blood? It goes as urine to the bladder.

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