1. Diet and Digestion
Lesson Objectives

2. DD1 Diet and deficiencies
Recall that balanced diet includes carbohydrate, protein, lipid, vitamins, minerals, water and dietary fibre
Recall sources and functions of carbohydrate, protein, lipid (fats and oils) in the diet,
Vitamins A, C and D, and the mineral ions Ca and Fe, water and fibre (roughage).

3. DD2 Biological molecules and food tests
Test the following food groups: Benedicts (glucose),Iodine (starch), Biuret (protein), alcohol emulsion (fat)
Describe structure of carbohydrates, proteins and lipids as large molecules made up from smaller basic units: starch and glycogen from simple sugar; protein from amino acids; lipid from fatty acids and glycerol

4. DD3 The Mouth and Amylase
Recognise the structures of the human alimentary canal (gut)
Describe functions of mouth (incl teeth/saliva), oesophagus,
Explain how food is moved through the gut by peristalsis
Explain digestion of starch to glucose by amylase and maltase,
explain active sites – theory of enzyme action

5. DD4 The Stomach and Pepsin
Describe functions of stomach,
Describe the digestion of proteins to amino acids by proteases
Define ingestion, digestion, absorption, assimilation and egestion

6. DD5 Bile salts and Lipase
Describe digestion of lipids to fatty acids and glycerol by lipase
Carry out a practical demonstrating the effect of Bile salts on digestion of fat
Explain the role of the pancreas
Describe how the functioning of enzymes can be affected by changes in temperature
State bile is produced by liver, stored in the gall bladder,
Describe the role of bile in neutralising stomach acid and emulsifying lipids

7. DD6 The Model Gut and Small Intestine
Draw a villus, and explain how villi help absorption in S.I.
Explain the role of the small intestine, large intestine
Define : diffusion, osmosis and active transport

8. DD7 Literacy task
Travel supermarket or Vitamin deficiencies

9. DD8 Enzymes and pH (triple only) Key assessment
Explain how the functioning of enzymes can be affected by changes in pH