DIGESTIVE SYSTEM LESSON 1111111111111 WEEK 2.pptx

digestive

1. Science 6 Week 2 – Lesson 1

2. How do we get those important minerals and vitamins from foods?

3. Digestive system

4. ORGAN SYSTEM Integumentary System Nervous System Respiratory System Circulatory System Muscular System Skeletal System Endocrine System Digestive System Reproductive System Excretory System Lymphatic System

5. DIGESTIVE SYSTEM A collection of organs that breaks down food into energy.

6. What are the functions of the digestive system?

7. FUNCTIONS: Ingestion The process of putting food into your mouth.

8. FUNCTIONS: Digestion Refers to the breakdown of food into small pieces or molecules that can be used by the body.

9. TYPES OF DIGESTION Mechanical Digestion Chemical Digestion The physical breakdown of food into smaller pieces.

10. Grinding, biting, chewing of food are all mechanical digestion. It also includes the moving down of food to the stomach.

11. Peristalsis is the rhythmic, involuntary contraction of the muscles of the esophagus .

12. TYPES OF DIGESTION Mechanical Digestion Chemical Digestion The physical breakdown of food into smaller pieces. It involves the breakdown of food chemically into simpler nutrients that can be used by the cells.

13. Acids and enzymes present in the stomach and intestines facilitate the chemical digestion.

14. FUNCTIONS: Absorption Nutrients from the food you eat pass through the wall of the digestive system into your blood.

15. FUNCTIONS: Elimination Some food substances that are not absorbed and digested are eliminated from the body as feces .

16. Cellulose is one example of a material your body cannot digest.

17. Parts of the Digestive system

18. TYPES OF DIGESTION Alimentary canal Accessory organ Are organs that help in the digestion process by secreting enzymes to further breakdown food particles. Also known as digestive tract. It refers to the tubular passage through which the food passes and is digested.

19. Alimentary canal includes: Mouth Pharynx Esophagus Stomach Small intestine Large intestine Rectum Anus

20. Accessory organ includes: Salivary Glands Liver Gallbladder Pancreas

21. Let us summarize!

22. Homework # 1 BRING YOUR ART MATERIALS TOMORROW.

23. The journey of food from the Mouth to Anus

24. 1. Mouth

25. Mouth Digestion begins in the mouth with the help of your teeth, tongue, and salivary glands.

26. While you are chewing, salivary gland secrete saliva to moisten the food you eat. Food that has been chewed and mixed with saliva is called bolus , which is a ball of partially digested food.

27. 2. Esophagus

28. Esophagus A muscular tube transports bolus from mouth to stomach.

29. Bolus keeps moving down the stomach through peristalsis.

30. 3. Stomach

31. Stomach A J-shaped muscular sac that digests and temporarily stores food.

32. Stomach contains digestive juices: Hydrochloric Acid and Pepsin

33. Hydrochloric Acid A gastric juice that prepares protein in the stomach for digestion and kills bacteria found on food.

34. Pepsin Breaks down proteins into smaller pieces.

35. The digested food leaves stomach as a thick liquid mixture called chyme .

36. 4. Small intestine

37. Small intestine It has smooth muscles that also churns the food. This is where most of the chemical digestion process happens.

38. Liver Pancreas Gall bladder

39. When chemical digestion is completed, food nutrients are absorbed through the folds in the lining of the small intestine called villi.

40. 5. Large intestine

41. Large intestine Has main part, the colon with rectum that opens to the anus at its end.

42. Water is reabsorbed. The undigested material forms into a solid mass called feces .

43. 6. Rectum

44. Rectum Serves as storage site of feces before it is eliminated from the digestive tract.

45. 7. Anus

46. Anus A muscular opening and the end of the digestive tract.

47. Let us summarize!

48. Book Exercise # 1 Answer Self-Check PART B only on page 100 of your textbook. To be passed today.

49. Common Ailments of the Digestive system

50. Diarrhea Characterized by loosed and watery stool and frequent bowel movement.

51. Constipation Characterized by compact, dry, and hard stool.

52. Gastroesophageal reflux disorder (GERD) Occurs when the acid from stomach flows back to esophagus .

53. This happens wjen the muscular valve in the esophagus does not close properly.

54. Gallstone Are stones or lumps that build up in the bladder.

55. These stones are hardened cholesterol and pigments in the bile.

56. Peptic Ulcer A painful wound in the stomach and small intestine.

57. Caused by bacteria that weakens the protective coating in the stomach and small intestine.

58. Colorectal Cancer Occurs when tumors form in the lining of the large intestine.

59. Proper Care for the Digestive system

60. Proper Care Proper Nutrition Proper Hygiene Health Habits Regular Exercise