BRAINCAKEDigestion
Revision notes for Digestion in AQA Biology (7401). Read the start of any lesson here, then sign in free for the whole lesson, the R.E.C.I.P.E. recall steps and the quiz.
- DigestionDigestion is the process that breaks down large insoluble food compounds such as carbohydrates, lipids and proteins into small water-soluble…
- The Digestive SystemThe digestive system is a long muscular tube into which glands secrete hydrolytic enzymes, chemicals to maintain the pH for the enzymes to work such…
- Carbohydrate DigestionWhen food enters the mouth it is chewed and mixed with saliva.
- Lipid DigestionSince lipids are hydrophobic molecules, they need to be mechanically broken down into made into smaller particles and mixed with enzymes so that the…
- Protein DigestionHydrolysis is the breaking of a covalent bond by the addition of a water molecule.
- Structure of the IleumThe walls of the ileum are folded with finger-like projections called villi.
- Absorption of Amino AcidsAbsorption of digested food occurs in the ileum of the small intestine.
- Absorption of MonosaccharidesOn the membrane of the epithelial cell adjacent to the blood the sodium-potassium pump removes sodium from the epithelial cell lowering its…
- Absorption of TriglyceridesLipids and glycerol move into the lacteals and join the lymphatic system.
- Absorption of Fatty AcidsBile salts emulsify fats.