The Digestive System


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What is the digestive system for. Organs and disease.

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The Digestive System

  1. 1. Learn about The Digestive System By Jess Mays Yr9, Paeroa College, New Zealand
  2. 2. Contents Slide 3 The digestive System Diagram 4 The purpose of the digestive System 5 10 interesting facts 6-10 10 questions 11 Diagram of the stomach 12 The Purpose of the Stomach How does the Stomach work 13 The large Intestine diagram 14 The Purpose of the Large Intestine How does the large intestine work 15 Stomach Cancer: Symptoms 16 Stomach Cancer: Treatment 17 Stomach Cancer: Prevention
  3. 3. The digestive System Back to contents
  4. 4. The Purpose of the Digestive System Back to contents The purpose of the Digestive system is to break down food and absorb nutrients.
  5. 5. 10 interesting facts Back to contents 1. The stomach is lined with three layers of powerful muscles. 2. The liver is the largest organ in the body. 3. In the mouth, food is either cooled or warmed to a more suitable temperature. 4. The liver performs more than 500 functions. 5. The large intestine is about 5 feet long. 6. A full grown horse?? Their coiled up intestines are 89 feet long. 7. Food stays in your stomach for 2 to 3 hours. 8. About 400 gallons of recycled blood are pumped through the kidneys every day. 9. We make 1 to 3 pints of saliva a day. 10. The average male will eat about 50 tons of food during his lifetime
  6. 6. How much do you know? Back to contents 1. How many layers does the stomach have? A. 4 layers B. 1 layer C. 3 layers 2. What is the largest organ in the body? A. The liver B. The stomach C. The heart 3. What happens when food is in your mouth? A. The food goes soggy B. The food is either cooled or warmed C. The food dissolves
  7. 7. How much do you know? Back to contents 4. How many functions does the liver perform A. 500 functions B. 1000 functions C. 890 functions 5. How long is your large intestine? A. 1 foot long B. 19 centimetres long C. 5 feet long
  8. 8. How much do you know? Back to contents 6. How long is a full grown horse’s intestine? A. 100 feet long B. 89 feet long C. 7 feet long 7. How long does food stay in your stomach for? A. 1 day B. 10 minutes C. 2-3 hours
  9. 9. How much do you know? Back to contents 8. How many gallons of recycled blood is pumped through our kidneys everyday? A. 10 gallons B. 150 gallons C. 400 gallons 9. How many pints of saliva do we make a day? A. 1-3 pints a day B. 4-5 pints a day C. 10 pints a day
  10. 10. How much do you know? Back to contents 10. True or false the average male will eat about 50 tons of food during his lifetime A. True B. False
  11. 11. Back to contents The Stomach
  12. 12. The Purpose of the Stomach Back to contents 1. Stores the food we ate 2. Breaks down the food into a liquidly mixture 3. Mix with Enzymes which is chemical that breaks down food. 4. Slowly empty that liquidly mixture into the small intestine. The stomach stores the food we eat and breaks down the food into a liquidly mixture. How Does The Stomach Work Once food enters the stomach through the oesophagus, it reaches the stomach, then the acid in it breaks up the food.
  13. 13. The Large Intestine Back to contents
  14. 14. The Purpose of the Large Intestine Back to contents The large intestine, or large bowel, functions mainly to absorb water from the undigested food back into the blood. This makes the faeces more solid. It also absorbs vitamins made by the bacteria which live in the large intestine. How Does The Large Intestine Work By contraction of its muscular walls the food mass is sent forward and, as it is carried along, some of the secretions from the intestinal lining, bile and the pancreas helps break it down
  15. 15. Stomach Cancer •Early •Indigestion or a burning sensation (heartburn) •Loss of appetite, especially for meat •Late •Abdominal pain or discomfort in the upper abdomen •Nausea and vomiting •Diarrhea or constipation •Bloating of the stomach after meals •Weight loss •Weakness and fatigue •Bleeding (vomiting blood or having blood in the stool), which can lead to anemia •To find the cause of symptoms, the doctor asks about the patient's medical history, does a physical exam, and may order laboratory studies. Symptoms Back to contents
  16. 16. stomach Cancer Treatment Like any cancer, treatment is adapted to fit each person's individual needs and depends on the size, location, and extent of the tumor, the stage of the disease, and general health. Cancer of the stomach is difficult to cure unless it is found in an early stage (before it has begun to spread). Unfortunately, because early stomach cancer causes few symptoms, the disease is usually advanced when someone finds they have it. Treatment for stomach cancer may include surgery, chemotherapy, and/or radiation therapy. Back to contents
  17. 17. How to prevent it? Back to contents Doctors cannot always explain why one person gets cancer and another doesn't. However, scientists have studied general patterns of cancer in the population to learn what things around us and what things we do in our lives may increase our chance of developing cancer Some of the risk factors for cancer can be avoided, but many cannot. Both smoking and inheriting specific genes could be considered risk factors for certain kinds of cancer, but only smoking can be avoided.
  18. 18. THE END