Digestive system

• What are the steps in the digestive system?

  Mouth, eosophagus, stomach, small intestine, bloodstream, large intestine, excrete
• What happens in the mouth?


  Saliva produced in salivarary gland which gives of the enzyme amalase which help break down carbohydrates.
• What happens in the stomach?

  Muscles contract, produces pepsin which break down proteins, produces HCL which kills bacteria and allows pepsin to work (PH)
• What happens in the small intestine?

  The digestied food is absorbed into the bloodstream through diffusion. All digestive enzymes are produced from pancreas and pancreatic juices.
• What happens in the large intestine?

  The left over food from the small intestine will come into here and will be exreted
• Where is bile produced?

  Bile is made in the liver and stored in the gall bladder
• What does bile do?

  Emmulsifies fats and neutralises acid from stomach
• What adaptations does the small intestine have?

  Villi, thin cell outer layer, very good conc gradient(blood supply)
• How does the villi help the small intestine?

  Has a large surface area so increases the rate of diffusion
• How does a good blood supply help the small intestine?

  Improves conc gradient so rate of diffusion increase
• How does the thin layer of cells help the small intestine?


  It enables the bloodstream to absorb the food molecules quicker because it hasnt got as far distance to go across the partially permeable membrane
• What are amylase?

  Digestive enzyme. Break down carbohydrates. Produced in salivary glands, pancreas and small intestine.
• What are protease?

  Digestive enzyme. Break down proteins. Produce amino acids. Produced in pancreas, small intestine and stomach
• What is lipases?

  Digestive enzyme. Breaks down fats(lipids). Produced in the pancreas and small intestine.