digestion

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  • Created by: nida
  • Created on: 21-01-13 16:42
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  • DIGESTION
    • 1) mechanical digestion begins where the teeth grind the food and the tongue mixes saliva with the food. The saliva contains amylase which begins chemical digestion and also lubricates the food so that it can be moved into the oesophagus.
  • 2) the epiglottis stops the foo going down the trachea.
    • DIGESTION
      • 1) mechanical digestion begins where the teeth grind the food and the tongue mixes saliva with the food. The saliva contains amylase which begins chemical digestion and also lubricates the food so that it can be moved into the oesophagus.
    • 3) the food mixed with the saliva is called bolus. it moves down oesophagus through muscle contractions. this process is called peristalsis.
  • 4) the food then moves down the stomach where it mixes with hydrochloric acid. which kills bacteria and pepsin which is an enzyme which breaks down protein.
    • 4) food then enters the small intestines.
      • 5) this is where it is broken down  and absorbed. into the blood using the three enzymes lipase, carbohydrate and protease. water is taken out of the food in the large intestine.

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