The digestive system breaks down food and extracts nutrients. Food passes through the mouth, esophagus, stomach, small intestine where nutrients are absorbed, and large intestine where water is removed before waste exits the body. The excretory system includes kidneys which remove waste from the blood to be stored in the bladder and later expelled as urine.

1. The Digestive System Life Science 5 8/08

2. The digestive system is a group of organs that process the food we eat and takes out the nutrients our bodies need.

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. After food is chewed up and mixed with saliva it moves down a tube called the esophagus.

5. The esophagus delivers the food to a storage bag, the stomach where it is mixed with other chemicals and digestive juices.

6. Bile is an important digestive juice that is made in the liver.

7. After it leaves the stomach the material moves into a long, folded small intestine where the nutrients are removed.

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. After the nutrients have been removed the watery material moves into the large intestine , also called the colon. The large intestine is shorter but bigger around than the small intestine. Stomach Small intestine Large intestine

10. Most of the liquid is removed from the used-up food material in a healthy person’s large intestine. After that the solid waste goes into the toilet.

11. Let’s review: After it leaves the mouth the order of the organs that food passes through is

12. Let’s review: After it leaves the mouth the order of the organs that food passes through is 1. Esophagus

13. Let’s review: After it leaves the mouth the order of the organs that food passes through is 1. Esophagus 2. Stomach

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. 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

17. 1

18. 1 2

19. 1 2 3

20. 1 2 3 4

22. Excretory system

23. The excretory system removes cellular waste from the blood.

24. The excretory system removes cellular waste from the blood. It’s often called the urinary system because urine is how the waste leaves the body.

25. The main organs in the excretory system are the kidneys.

26. Every living animal cell creates waste called urea as it uses energy. This waste is carried away in the blood.

27. Blood flows through the kidneys where urea is removed.

28. Urea is removed through tiny tubes in the kidneys called nephrons.

29. Urea and other waste products are sent from the kidneys as urine (a yellow liquid) in tubes called jjjjjjjjjjjj ureters , or urine tubes .

30. The ureters take urine to a bag-like muscle called the bladder where it is stored until we go to the bathroom.

31. The excretory system

32. Let’s review: What is the tube that carries food from the mouth to the stomach ?

33. Let’s review: What is the tube that carries food from the mouth to the stomach ? The esophagus

34. Let’s review: What is the tube that carries food from the mouth to the stomach ? The esophagus

35. Let’s review: Where does food go after it leaves the stomach ?

36. Let’s review: Where does food go after it leaves the stomach ? Small intestine

37. Let’s review: Where does food go after it leaves the stomach ? Small intestine

38. Let’s review: Where is most water removed from food material before it leaves the body ?

39. Let’s review: Where is most water removed from food material before it leaves the body ? Large intestine also called the colon

40. Let’s review: Where is most water removed from food material before it leaves the body ? Large intestine also called the colon

41. Let’s review: Where are nutrients removed from food ?

42. Let’s review: Where are nutrients removed from food ? Small intestine

43. Let’s review: Where are nutrients removed from food ? Small intestine The villi

44. Let’s review: What are two examples of digestive juices ?

45. Let’s review: What are two examples of digestive juices ? Saliva from the mouth

46. Let’s review: What are two examples of digestive juices ? Saliva from the mouth

47. Let’s review: What are two examples of digestive juices ? Saliva from the mouth Bile from the liver

48. Let’s review: What are two examples of digestive juices ? Saliva from the mouth Bile from the liver

49. Let’s review: What are the most important organs in the excretory system?

50. Let’s review: What are the most important organs in the excretory system? The kidneys

51. Let’s review: What are the most important organs in the excretory system? The kidneys

52. Let’s review: What do the kidneys do?

53. Let’s review: What do the kidneys do? They remove cellular waste (urea) from the blood.

54. Let’s review: What do the kidneys do? They remove cellular waste (urea) from the blood.

55. Let’s review: What happens to the waste after the kidneys remove it from the blood?

56. Let’s review: What happens to the waste after the kidneys remove it from the blood? It goes as urine to the bladder.

57. Let’s review: What happens to the waste after the kidneys remove it from the blood? It goes as urine to the bladder.