chapt 5.3 digestion

• digestion

  meaning : process where large food molecules are broken down into smaller food molecules so that they can be absorbed into the body cells
• physical digestion

  definition: mechanical break up of food into smaller particals, increase the surface area to vol ratio of the food so that digestive enzymes can act on it more efficiently
• physical digestion

  in mouth : teeth & tongue
• physical digestion

  in the stomach : continual contractions and relaxations of the muscles in the stomach churn food

  1. breaks up food
  2. mixes food with digestive enzymes
• physical digestion

  in small int : fats broken up into smaller molecules by bile salts
• chemical digestion

  defenition : breaking down of large food molecules into small soluble molecules that can be absorbed

  1. proteins
  2. fats
  3. carbs