8-Q4

• Food


  give people energy
• complex molecules


  molecules? That can be seen by naked eyes
• membrane of body cell


  Complex molecule cannot pass through
• Cell


  Basic unit of life
• esophagus


  a strechy pipe tube
• esphagus

  10 cm long
• Undergo digestion


  1. Covered into simple molecules

  2. Can pass through cell membrane
• Digestive system


  A group of organs working together to convert food into energy and basic nutrients to feed the entire body
• Food passes through a long tube inside the body known as the alimentary canal or the gastrointestinal tract
• Digestive system


  • Gastrointestinal tract
  • Accessory parts
• Gastrointestinal tract


  • Accessory parts
  • Main part of digestive system
• Gastrointestinal tract


  Main part of the digestive system
• Path of food

  1. Esophagus

  2. Stomach

  3. Small intestine

  4. Large intestine
• A stretchy pipe/tube that's about 10 inches (25 centimeters) long, moves from the back of your throat to your stomach

  Esophagus
• Stomach


  A stretchy sack, shaped like a letter C, stores the food you've eaten, breaks down the food into a liquidy mixture, slowly empties the liquidy mixture into the small intestine
• Small intestine


  A long tube about 1/2 inches to 2 inches (about 3.5 to 5 centimeters) around and 22 feet long (6.7m), packed beneath the stomach, breaks down the food mixture so the body can absorb the vitamins, minerals, carbohydrates and fats, keeps the food for 4 hours and turns it into a very thin, watery mixture
• Large intestine
• Large intestine


  • Fatter than small intestine
  • Almost the last stop on the digestive tract
  • Into a very thin, watery mixture
• Large intestine


  • About 4 inches around (about 7 to 10 centimeters)
  • About 5 feet long (about 1.5 meters)
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• Accessory Glands


  Organs that are associated with the food tube because they produce secretion that aids digestion
• Salivary glands

  • 2 parotid glands
  • 2 submaxillary glands
  • 2 sublingual glands
• Salivary glands


  Secrete saliva which contain a starch digesting enzyme called salivary amylase or Ptyalin
• Liver


  • Largest accessory organ in the body
  • Produces a yellow-green liquid called bile stored in the gall bladder
• Pancreas


  Secretes pancreatic juice that contains digestive enzymes