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Unit 3 3a nutrition


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Nutrition and digestive system.

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Unit 3 3a nutrition

  2. 2. Unit 3 A : Human Nutrition. INDEX
  3. 3. Unit 3(a): Human body. 1.             New words. Breaking down-romper/deshacer. Break up-partir. . Slippery-resbaladiza To swallow-tragar. Small intestine-intestino delgado. Large intestine- intestino grueso. Gall bladder- vesícula biliar. Bile- bilis Bolus of food- bolo alimenticio. Pharynx-faringe. Chyme- quimo Chyle- quilo
  4. 4. Unit 3(a): Human body. 1.        New words. Salivary glands –glándulas salivares. Liver-hígado. Juices- jugos. Takes place- tiene lugar. Pancreas- pancreas. Plenty- mucho. Gastric juices- jugos gástricos.
  5. 5. Unit 3(a): Human body. -Definition of Nutrition. Nutrition consits of extracting nutrients and oxygen, distributing them around the body and excreting the residues.
  6. 6. Unit 3(a): Human body. 1. The Nutrition processes.   Digestion. Consists of breaking down food into simpler substances until we obtain energy. Breathing. we obtain the oxygen from the air.Our cells need to work and excrete the carbon dioxide that we produce as a residue.
  7. 7. Unit 3(a): Human body. 1.   Circulation. Consists of transporting nutrients, oxygen and residues around the body. Excretion. Is the expulsion of the residues.
  9. 9. NUTRITION SYSTEMS: The Digestive system The Respiratory system The Circulatory system The Excretory system
  10. 10. DIGESTION It consists in breaking down food into simpler substances until we obtain the nutrients. It includes:  The digestive tract  The digestive glands. 
  11. 11. The digestive tract includes: Mouth  Pharynx Oesophagus (foodpipe) Stomach Small Intestine Large Intestine The digestive glands are: Salivary glands Gall bladder Liver Pancreas
  12. 12. :
  13. 13. Mouth It breaks up food and makes it slippery so it is easy to swallow.
  14. 14. Mouth
  15. 15. Pharynx  It is the passage to the stomach and lungs.
  16. 16. Pharynx
  17. 17. Oesophagus (gullet)(food pipe)  the tube that connects your mouth and your stomach
  18. 18. Stomach  A stretchy bag that helps to break food into smaller pieces so your body can use it for energy and nutrition.
  19. 19. Oesophagus Stomach
  20. 20. Small Intestine  Tube that is 20 feet long.  It absorbs digested food into the blood.  Food stays in your small intestine for 4 to 8 hours
  21. 21. Small Intestine
  22. 22. Large Intestine  Tube that is 5 feet long.  Gets waste from small intestine.  Waste stays for 10 to 12 hours
  23. 23. Large Intestine
  24. 24. Gall Bladder  Storage tank for bile (a greenishyellow liquid) that helps your body break down and use fats.  Located under your liver.  Shaped like a pear.
  25. 25. Gall Bladder
  26. 26. Liver  Factory for antibodies and bile.  Stores vitamins and sugars until your body needs them.
  27. 27. Liver
  28. 28. Pancreas  It makes chemicals to digest all kinds of food.
  29. 29. Functions  Digest  Take the food we eat. the nutrients out of your food so your body can use it.
  30. 30. Summary Functions  Digests food  Absorbs nutrients for the body Components  Mouth  Oesophagus  Stomach  Small intestine  Large intestine  Pancreas  Liver  Gall Bladder
  31. 31. Stages of Digestion
  32. 32. Four Stages of Digestion Ingesting  Digesting  Absorbing  Eliminating 
  33. 33. Stage 1:Digestion in the mouth and oesophagus   The teeth cut the food. The salivary glands produce saliva. The tongue mixes the saliva with the food and forms a bolus of food. This passes down the pharynx and the oesophagus.
  34. 34. Esophagus: as food passes through the pharynx, the epiglottis covers the airway tube.  The food moves on to the esophagus.  The esophagus is a tube that connects the pharynx and the stomach. 
  35. 35. The esophagus is long and muscular  The bolus is pushed through the esophagus in a process called peristalsis. 
  36. 36. Stage 2: Digestion in the Stomach The stomach produces substances called gastric juices. When these juices mix with the bolus of food, they form a partially digested food paste called chyme.
  37. 37. Stage 3: Digestion in the Small Intestine The pancreas produces pancreatic juices.  The liver produces bile.  The intestine produces intestinal juices.  These juices and the movements of the small intestine form chyle which contains the nutrients.
  38. 38. Stage 3: Digestion in the Small Intestine ABSORPTION:  The walls of the intestine contain veins and capillaries which absorb the nutrients.  They are transported through the circulatory system all around the body in the blood. 
  39. 39. Stage 4: Digestion in the Large Intestine  In the large intestine, water is extracted from the residues which form faeces.  These are excreted through the anus.
  40. 40. Activities:  3.1 page 23 – Chyme is formed in the sotmach.  Faeces are formed in the large intestine.  Capillaries absorb the nutrients in the small intestine.  Food is masticated in the mouth.
  41. 41. Activities:  Digestive glands are:  Salivary glands, liver, gall bladder, pancreas.  Parts of digestive tract:  Mouth, tongue, pharynx,oesophagu s, small intestine, large intestine.
  42. 42. Digestion Summary: ORGANS FUNCTION MOUTH with teeth, tongue and salivary glands. Cuts the food and produces SALIVA PHARYNX AND OESOPHAGUS Move the food with movements called PERISTALSIS BOLUS STOMACH Produces GASTRIC JUICES CHYME SMALL INTESTINE with Liver, Gall bladder and Pancreas Produces CHYLE INTESTINAL JUICES AND BILE and absorbs NUTRIENTS LARGE INTESTINE Excrete RESIDUES FOOD TRANSFORMATION BOLUS FAECES
  43. 43. Healthy Habits  Eat food that is high in fiber like fruits and vegetables
  44. 44. Drink plenty of water
  45. 45.  Chew your food completely before you swallow
  46. 46. Avoid foods high in fat
  47. 47. Interesting Facts  Food is in your digestive system for about 24 hours
  48. 48.  Your stomach stretches when you eat like a balloon being filled with air
  49. 49.  You have a trap door called the epiglottis to cover your windpipe when you swallow.
  50. 50.  Your stomach mashes your food the way a baker kneads dough for bread.
  51. 51. Summary Healthy Habits  Eat high fiber foods  Drink lots of water  Chew food well  Avoid high-fat foods